# Product Requirements Document (PRD) - Angular Clarity Boilerplate

## 1. Product Vision

To provide a robust, scalable, and feature-rich boilerplate that serves as a foundational template for building modern, enterprise-grade web applications using Angular and the VMware Clarity Design System. The vision is to accelerate the development lifecycle by offering a pre-configured, best-practice project structure.

## 2. Target Audience

The primary target audience consists of **Angular developers and development teams** who require a standardized, efficient, and consistent starting point for new projects. This includes:

* **Enterprise Development Teams:** Teams that need to maintain a consistent look and feel across multiple applications.
* **Independent Developers:** Individuals looking to quickly bootstrap new projects without spending significant time on initial setup and configuration.

## 3. User Stories (Developer Stories)

### User Story 1: Quick Project Initialization
- **As a developer, I want to clone the repository and run `npm install` and `ng serve` to get a live development server running, so that I can bypass manual setup and start building features immediately.**
- **Acceptance Criteria:**
    - Given I have Node.js and Angular CLI installed,
    - When I clone the repository, install dependencies, and run the start command,
    - Then the application compiles successfully and is accessible in my browser at `localhost:4200`.

### User Story 2: Add a New Feature
- **As a developer, I want to create a new lazy-loaded feature module with its own components and routing, so that I can add new sections to the application in a scalable way.**
- **Acceptance Criteria:**
    - Given the boilerplate is running,
    - When I use the Angular CLI to generate a new module and add it to the main routing configuration,
    - Then I can navigate to the new feature's route, and its components are rendered correctly.

### User Story 3: Utilize Shared Components
- **As a developer, I want to use a component from the `SharedModule` within a new feature module, so that I can reuse common UI elements and maintain consistency.**
- **Acceptance Criteria:**
    - Given I have a new feature module,
    - When I import the `SharedModule` into my feature module,
    - Then I can use the shared components (e.g., a custom card or loader) in my feature's templates without errors.

## 4. Functional Requirements

- **FR-001: Pre-configured Angular Environment:** A ready-to-use Angular CLI project with all necessary dependencies and build configurations.
- **FR-002: Clarity Design System Integration:** Full integration of Clarity UI components and styles, ready for immediate use.
- **FR-003: Scalable Architecture:** A modular structure featuring a `CoreModule` for singleton services and a `SharedModule` for reusable UI components, directives, and pipes.
- **FR-004: Responsive Layout:** A default application shell with a responsive header, navigation sidebar, and main content area.
- **FR-005: Routing:** A pre-configured routing module with examples of lazy-loaded feature modules.
- **FR-006: Theming:** Basic support for Clarity's light and dark themes.

## 5. Non-Functional Requirements

- **NFR-001: Performance:** The initial boilerplate should be lightweight, ensuring fast development server startup times and optimized production builds.
- **NFR-002: Usability (Developer Experience):** The codebase must be clean, well-commented, and logically organized to provide an excellent developer experience.
- **NFR-003: Maintainability:** The modular architecture must facilitate easy updates to dependencies and allow for the addition of new features without introducing breaking changes to the core structure.
- **NFR-004: Scalability:** The architecture is designed to support the growth of large, enterprise-scale applications.
- **NFR-005: Extensibility:** The boilerplate should be easy to customize and extend with additional libraries, modules, and configurations as per project-specific needs.

## 6. Out of Scope

The following features and functionalities are explicitly out of scope for the boilerplate:

-   **Backend Implementation:** This is a frontend-only boilerplate and does not include any backend code or database.
-   **Authentication/Authorization Logic:** While the architecture supports the implementation of security features, no pre-built authentication or authorization logic is included.
-   **State Management:** The boilerplate does not include a state management library (e.g., NgRx, Akita) by default, allowing developers to choose the best solution for their needs.
-   **Business Logic:** No specific business logic or application features are included beyond the basic structural components.
-   **CI/CD Pipelines:** While the project is ready for CI/CD, no pre-configured pipelines are included.

---

## PRD UPDATE - 2025-10-16 14:07:27

# Product Requirements Document (PRD)
Generated: 2025-10-16T14:05:00

## 1. Executive Summary
The "To Do List System App" is a web-based application designed to provide users with an intuitive and efficient platform for managing their daily tasks. Leveraging an Angular Clarity frontend for a rich user experience and a robust Python Flask backend with PostgreSQL for data persistence, the application's Minimum Viable Product (MVP) will focus on core task management functionalities: creating, viewing, updating, deleting, and toggling the completion status of tasks. This system aims to reduce cognitive load and improve productivity by centralizing task organization.

## 2. Product Vision & Strategy
**Product Vision:** To empower individuals to effortlessly organize their daily responsibilities, improve productivity, and achieve a sense of accomplishment through a clear and intuitive task management system.

**Strategic Goals (MVP):**
*   **SG1: Core Functionality Delivery:** Successfully implement and deploy the foundational CRUD operations for tasks, including status toggling.
*   **SG2: User Adoption (Internal):** Achieve high satisfaction from internal testers/stakeholders with the MVP's usability and core features.
*   **SG3: Technical Robustness:** Ensure the system is stable, performant, and built on a scalable architecture for future enhancements.

**Success Metrics (MVP KPIs):**
*   **Daily Task Creation Rate:** Number of tasks created per day.
*   **Task Completion Rate:** Percentage of tasks marked as completed.
*   **Average Time to Complete a Task (System Usage):** Tracks how quickly users interact with features.
*   **System Uptime & Response Time:** Measures system reliability and performance.

## 3. Target Users & Personas
**Primary Target User:** The "Busy Individual" (e.g., student, professional, freelancer) who needs a simple, reliable way to keep track of personal and professional obligations.

**Persona: Alice, The Organized Achiever**
*   **Demographics:** 32 years old, Marketing Manager, Lives in a city.
*   **Technographics:** Uses various productivity apps, comfortable with web-based tools, owns a laptop and smartphone.
*   **Goals:**
    *   Keep track of multiple project tasks and personal errands without missing deadlines.
    *   Quickly add new tasks as they arise.
    *   Visually identify what needs to be done and what's completed.
    *   Prioritize tasks effectively.
*   **Pain Points:**
    *   Tasks are scattered across notebooks, emails, and sticky notes.
    *   Forgets minor tasks due to lack of a centralized system.
    *   Feels overwhelmed by a long list of tasks without clear status.
*   **User Journey (MVP Focus):**
    1.  **Discover:** Alice hears about a simple new To-Do app.
    2.  **Access:** Alice opens the web application in her browser.
    3.  **Onboard:** Sees a clean interface with an option to add a new task.
    4.  **Create Task:** Adds "Send Q3 Report" with a description.
    5.  **View Tasks:** Sees "Send Q3 Report" in her list, alongside "Buy Groceries".
    6.  **Update Task:** Realizes she completed "Buy Groceries" and marks it as "Completed".
    7.  **Delete Task:** Decides "Clean Desk" is no longer a priority and deletes it.

## 4. Problem Statement
Many individuals struggle to effectively manage their daily responsibilities and commitments, leading to missed deadlines, forgotten tasks, and increased stress. Existing solutions are often overly complex, lack an intuitive interface, or are fragmented across multiple platforms, hindering consistent task tracking and completion.

## 5. Solution Overview
The To Do List System App will provide a straightforward, web-based interface for users to centralize and manage their tasks. The MVP will allow users to:
*   **Create:** Quickly add new tasks with a title and optional description.
*   **View:** See a comprehensive list of all their tasks.
*   **Update:** Modify existing task details (title, description, status).
*   **Toggle Status:** Mark tasks as pending or completed with a single action.
*   **Delete:** Remove tasks that are no longer relevant.

The application will be built using an Angular Clarity frontend for a modern UI, communicating with a Python Flask RESTful API backend, which persists data in a PostgreSQL database, all containerized with Docker for easy deployment and scalability.

## 6. Functional Requirements
*   **FR-001: Task Creation:** The system shall allow a user to create a new task with a title (mandatory) and an optional description.
*   **FR-002: Task Listing:** The system shall display a list of all existing tasks, showing at least the title and current status.
*   **FR-003: Task Detail View:** The system shall allow a user to view the full details of a single task, including title, description, and status.
*   **FR-004: Task Editing:** The system shall allow a user to update the title, description, and status of an existing task.
*   **FR-005: Task Status Toggling:** The system shall allow a user to toggle a task's status between "pending" and "completed".
*   **FR-006: Task Deletion:** The system shall allow a user to permanently delete an existing task.
*   **FR-007: Task Filtering by Status:** The system shall allow a user to filter the list of tasks to show only "pending" tasks, only "completed" tasks, or all tasks.

## 7. Non-Functional Requirements
*   **NFR-001: Performance:**
    *   The application should load within 3 seconds on a standard broadband connection.
    *   API responses for task CRUD operations should occur within 500ms under normal load.
*   **NFR-002: Usability:** The user interface shall be intuitive, consistent (leveraging Clarity Design System), and easy to navigate for users with basic computer literacy.
*   **NFR-003: Reliability:** The system shall have an uptime of at least 99.9% (excluding planned maintenance).
*   **NFR-004: Scalability:** The backend API and database architecture should be capable of supporting an increase in task data and concurrent users without significant performance degradation.
*   **NFR-005: Maintainability:** The codebase (frontend and backend) shall adhere to established coding standards and best practices, facilitating easy updates and feature additions.
*   **NFR-006: Extensibility:** The architecture shall be designed to easily incorporate future features like user authentication, categories, and due dates.
*   **NFR-007: Security (MVP Scope):**
    *   All data transfer between frontend and backend shall use HTTPS.
    *   Backend API shall implement basic input validation to prevent common data integrity issues. (Note: No user authentication for MVP).
*   **NFR-008: Responsiveness:** The UI shall be fully responsive, providing an optimal viewing and interaction experience across various devices (desktop, tablet, mobile).

## 8. Epic Stories

### Epic 1: Core Task Management
**Epic Description:** This epic encompasses all essential functionalities for users to create, view, modify, and remove their tasks from the system. It forms the backbone of the To Do List application.
**Business Value:** Provides users with the fundamental tools to manage their tasks, directly addressing the core problem of scattered and unmanaged obligations, thereby enhancing productivity and organization.
**Acceptance Criteria:**
*   Users can successfully perform CRUD operations on tasks.
*   All tasks are persistently stored and retrieved from the database.
*   API endpoints are functional and return appropriate responses.

**User Stories:**
-   **US-001:** Create New Task
    -   **As a** busy individual
    -   **I want to** quickly add a new task with a title and an optional description
    -   **So that** I don't forget important items and can centralize my responsibilities.
    -   **Acceptance Criteria:**
        -   [ ] The system provides a form to input task title and description.
        -   [ ] A task title is mandatory; description is optional.
        -   [ ] Upon submission, the new task appears in the task list with a default "pending" status.
        -   [ ] The backend API successfully stores the new task.
    -   **Story Points:** 5
    -   **Priority:** High

-   **US-002:** View All Tasks
    -   **As a** busy individual
    -   **I want to** see a clear list of all my tasks
    -   **So that** I can get an overview of my current commitments.
    -   **Acceptance Criteria:**
        -   [ ] The main view displays a list of all tasks.
        -   [ ] Each task in the list shows its title and current status.
        -   [ ] The list is retrieved from the backend API.
    -   **Story Points:** 3
    -   **Priority:** High

-   **US-003:** View Single Task Details
    -   **As a** busy individual
    -   **I want to** be able to click on a task to see its full details
    -   **So that** I can review all information related to a specific task.
    -   **Acceptance Criteria:**
        -   [ ] Clicking a task in the list navigates to a detail view for that task.
        -   [ ] The detail view displays the task's title, description, and status.
        -   [ ] The details are retrieved from the backend API.
    -   **Story Points:** 3
    -   **Priority:** Medium

-   **US-004:** Update Task Details
    -   **As a** busy individual
    -   **I want to** modify the title or description of an existing task
    -   **So that** I can correct errors or add more context to my tasks.
    -   **Acceptance Criteria:**
        -   [ ] The task detail view provides an option to edit the task.
        -   [ ] An editable form pre-fills with current task data.
        -   [ ] Upon saving changes, the task details are updated in the list and detail view.
        -   [ ] The backend API successfully updates the task in the database.
    -   **Story Points:** 8
    -   **Priority:** High

-   **US-005:** Delete Task
    -   **As a** busy individual
    -   **I want to** remove a task that is no longer relevant
    -   **So that** my task list remains clean and focused on current priorities.
    -   **Acceptance Criteria:**
        -   [ ] The task detail view provides an option to delete the task.
        -   [ ] A confirmation prompt is displayed before permanent deletion.
        -   [ ] Upon confirmation, the task is removed from the list and the database.
        -   [ ] The backend API successfully deletes the task.
    -   **Story Points:** 5
    -   **Priority:** High

### Epic 2: Task Status and Filtering
**Epic Description:** This epic focuses on allowing users to manage the completion status of their tasks and to organize their view of tasks based on this status.
**Business Value:** Enables users to track progress and quickly identify what tasks are pending versus completed, improving workflow efficiency and providing a sense of achievement.
**Acceptance Criteria:**
*   Users can easily mark tasks as complete or pending.
*   Users can filter their task list by completion status.

**User Stories:**
-   **US-006:** Toggle Task Status
    -   **As a** busy individual
    -   **I want to** easily mark a task as "completed" or revert it to "pending"
    -   **So that** I can track my progress and update my task list efficiently.
    -   **Acceptance Criteria:**
        -   [ ] Each task in the list view has an interactive element (e.g., checkbox, toggle button) to change its status.
        -   [ ] Changing the status is reflected immediately in the UI.
        -   [ ] The backend API successfully updates the task's status.
    -   **Story Points:** 5
    -   **Priority:** High

-   **US-007:** Filter Tasks by Status
    -   **As a** busy individual
    -   **I want to** filter my task list to show only pending, completed, or all tasks
    -   **So that** I can focus on specific categories of tasks without distraction.
    -   **Acceptance Criteria:**
        -   [ ] The task list view includes filtering options (e.g., dropdown, toggle buttons for "All", "Pending", "Completed").
        -   [ ] Selecting a filter immediately updates the displayed task list to show only matching tasks.
        -   [ ] The filtering logic can occur on the frontend or be supported by backend API query parameters.
    -   **Story Points:** 8
    -   **Priority:** Medium

## 9. User Interface Requirements
*   **UI-001: Clarity Design System Adherence:** The UI shall strictly adhere to the VMware Clarity Design System for all components (buttons, forms, tables, icons, layout), ensuring a consistent and professional look and feel.
*   **UI-002: Responsive Design:** The interface shall adapt gracefully to various screen sizes, from desktop monitors to mobile devices, maintaining full functionality and usability.
*   **UI-003: Task List View:** A clean, scannable list view for tasks, allowing easy identification of task titles and statuses.
*   **UI-004: Task Form:** An intuitive form for adding and editing tasks, with clear labels and validation messages.
*   **UI-005: Navigation:** Simple, clear navigation elements to access different views (e.g., "All Tasks", "Add New Task" or a unified view with filters).
*   **UI-006: Feedback:** Provide clear visual feedback for user actions (e.g., successful task creation, loading states, error messages).

## 10. Technical Requirements
*   **TR-001: Frontend Framework:** Utilize Angular (v12+) and TypeScript for building the Single-Page Application.
*   **TR-002: UI Library:** Integrate and utilize the Clarity Design System (v8+) for all UI components.
*   **TR-003: Backend Language & Framework:** Develop the RESTful API using Python and Flask (with Flask-RESTful).
*   **TR-004: Database:** Employ PostgreSQL as the primary database for persistent storage of task data.
*   **TR-005: ORM:** Use SQLAlchemy for object-relational mapping between the Python backend and PostgreSQL.
*   **TR-006: API Communication:** Frontend shall communicate with the backend via RESTful API calls over HTTP/HTTPS, exchanging data in JSON format.
*   **TR-007: Containerization:** Both the Angular frontend (served by Nginx) and the Flask backend shall be containerized using Docker.
*   **TR-008: Error Handling:** Implement global error handling on both frontend (HTTP interceptors) and backend to gracefully manage and report API errors.

## 11. Success Metrics & KPIs
*   **MVP Adoption:** % of internal testers successfully completing key task management workflows (create, complete, delete).
*   **Task Engagement Rate:** Number of tasks created, updated, and completed per unique user per week.
*   **Backend API Latency:** Average response time for API endpoints (target < 500ms).
*   **Frontend Load Time:** Average initial page load time (target < 3 seconds).
*   **Bug Count (Post-MVP Internal Launch):** Number of critical/high severity bugs reported per week.

## 12. Risk Assessment
*   **RA-001: Scope Creep (High):** Tendency to add features beyond MVP (e.g., authentication, categories, due dates).
    *   **Mitigation:** Strict adherence to the MVP definition and clear communication of scope boundaries. Ruthless prioritization.
*   **RA-002: Performance Bottlenecks (Medium):** Slow UI or API response times with increasing data/users.
    *   **Mitigation:** Regular performance testing, API optimization, efficient database queries, proper indexing, lazy loading for frontend modules.
*   **RA-003: Technical Debt (Medium):** Rushing development leading to unmaintainable code.
    *   **Mitigation:** Enforce coding standards, code reviews, allocate time for refactoring, utilize linters.
*   **RA-004: UI/UX Complexity (Medium):** Clarity Design System learning curve or misapplication leading to poor UX.
    *   **Mitigation:** Experienced Angular/Clarity developers, regular design reviews, adherence to Clarity guidelines.
*   **RA-005: Security Vulnerabilities (Low for MVP, High for future):** Lack of authentication in MVP makes it insecure for sensitive data.
    *   **Mitigation (for MVP):** Clearly communicate "no authentication" limitation. Ensure basic input validation. Plan for authentication as a primary future feature.
*   **RA-006: Environmental Setup Complexity (Medium):** Issues with Dockerizing and deploying the multi-service application.
    *   **Mitigation:** Detailed `docker-compose.yml` and deployment instructions, thorough testing of deployment scripts.

## 13. Timeline & Milestones
*(Note: This timeline is for the MVP and is high-level; specific dates will be refined during sprint planning.)*

*   **Phase 1: Planning & Setup (Week 1)**
    *   Complete Analysis, Architecture, Tech Stack Documents (Done).
    *   **Milestone:** PRD Finalized (Current).
    *   Initial project setup and repository creation.
*   **Phase 2: Backend Development (Weeks 2-3)**
    *   Set up Flask project, SQLAlchemy, and PostgreSQL.
    *   Develop Task API (CRUD, Status Toggle) endpoints.
    *   Implement backend unit tests.
    *   **Milestone:** Backend API Ready.
*   **Phase 3: Frontend Development (Weeks 4-5)**
    *   Integrate Angular Clarity boilerplate.
    *   Develop Task List, Detail, Create, Edit components.
    *   Integrate with backend API using Angular services.
    *   Implement frontend unit tests.
    *   **Milestone:** Frontend UI & API Integration Complete.
*   **Phase 4: Integration, Testing & Refinement (Week 6)**
    *   End-to-end testing of full application flow.
    *   Bug fixing and performance optimization.
    *   Internal User Acceptance Testing (UAT).
    *   **Milestone:** MVP Testing & Bug Resolution Complete.
*   **Phase 5: Deployment & Initial Launch (Week 7)**
    *   Finalize Docker configurations.
    *   Deploy to a staging/production environment.
    *   Post-launch monitoring.
    *   **Milestone:** MVP Deployment & Initial Launch.

## 14. Dependencies & Assumptions
*   **DEP-001:** Availability and stability of the backend API for all frontend operations.
*   **DEP-002:** The Clarity Design System components meet the majority of UI/UX needs without extensive custom styling.
*   **DEP-003:** Developers have expertise in Angular, TypeScript, Python, Flask, Docker, and SQL/PostgreSQL.
*   **ASM-001:** For the MVP, user authentication/authorization is explicitly out of scope, and all tasks are considered publicly accessible within the application context.
*   **ASM-002:** The development environment (Node.js, Angular CLI, Python, Docker) is stable and correctly configured.
*   **ASM-003:** Internet connectivity is consistently available for external library downloads during development and for users accessing the deployed application.
*   **ASM-004:** The chosen technology stack (Angular, Flask, PostgreSQL) is suitable and performant for the MVP requirements.


---

## PRD UPDATE - 2025-10-16 14:08:42

# Product Requirements Document (PRD)
Generated: 2025-10-16T14:05:00

## 1. Executive Summary
The "To Do List System App" is a web-based application designed to provide users with an intuitive and efficient platform for managing their daily tasks. Leveraging an Angular Clarity frontend for a rich user experience and a robust Python Flask backend with PostgreSQL for data persistence, the application's Minimum Viable Product (MVP) will focus on core task management functionalities: creating, viewing, updating, deleting, and toggling the completion status of tasks. This system aims to reduce cognitive load and improve productivity by centralizing task organization.

## 2. Product Vision & Strategy
**Product Vision:** To empower individuals to effortlessly organize their daily responsibilities, improve productivity, and achieve a sense of accomplishment through a clear and intuitive task management system.

**Strategic Goals (MVP):**
*   **SG1: Core Functionality Delivery:** Successfully implement and deploy the foundational CRUD operations for tasks, including status toggling.
*   **SG2: User Adoption (Internal):** Achieve high satisfaction from internal testers/stakeholders with the MVP's usability and core features.
*   **SG3: Technical Robustness:** Ensure the system is stable, performant, and built on a scalable architecture for future enhancements.

**Success Metrics (MVP KPIs):**
*   **Daily Task Creation Rate:** Number of tasks created per day.
*   **Task Completion Rate:** Percentage of tasks marked as completed.
*   **Average Time to Complete a Task (System Usage):** Tracks how quickly users interact with features.
*   **System Uptime & Response Time:** Measures system reliability and performance.

## 3. Target Users & Personas
**Primary Target User:** The "Busy Individual" (e.g., student, professional, freelancer) who needs a simple, reliable way to keep track of personal and professional obligations.

**Persona: Alice, The Organized Achiever**
*   **Demographics:** 32 years old, Marketing Manager, Lives in a city.
*   **Technographics:** Uses various productivity apps, comfortable with web-based tools, owns a laptop and smartphone.
*   **Goals:**
    *   Keep track of multiple project tasks and personal errands without missing deadlines.
    *   Quickly add new tasks as they arise.
    *   Visually identify what needs to be done and what's completed.
    *   Prioritize tasks effectively.
*   **Pain Points:**
    *   Tasks are scattered across notebooks, emails, and sticky notes.
    *   Forgets minor tasks due to lack of a centralized system.
    *   Feels overwhelmed by a long list of tasks without clear status.
*   **User Journey (MVP Focus):**
    1.  **Discover:** Alice hears about a simple new To-Do app.
    2.  **Access:** Alice opens the web application in her browser.
    3.  **Onboard:** Sees a clean interface with an option to add a new task.
    4.  **Create Task:** Adds "Send Q3 Report" with a description.
    5.  **View Tasks:** Sees "Send Q3 Report" in her list, alongside "Buy Groceries".
    6.  **Update Task:** Realizes she completed "Buy Groceries" and marks it as "Completed".
    7.  **Delete Task:** Decides "Clean Desk" is no longer a priority and deletes it.

## 4. Problem Statement
Many individuals struggle to effectively manage their daily responsibilities and commitments, leading to missed deadlines, forgotten tasks, and increased stress. Existing solutions are often overly complex, lack an intuitive interface, or are fragmented across multiple platforms, hindering consistent task tracking and completion.

## 5. Solution Overview
The To Do List System App will provide a straightforward, web-based interface for users to centralize and manage their tasks. The MVP will allow users to:
*   **Create:** Quickly add new tasks with a title and optional description.
*   **View:** See a comprehensive list of all their tasks.
*   **Update:** Modify existing task details (title, description, status).
*   **Toggle Status:** Mark tasks as pending or completed with a single action.
*   **Delete:** Remove tasks that are no longer relevant.

The application will be built using an Angular Clarity frontend for a modern UI, communicating with a Python Flask RESTful API backend, which persists data in a PostgreSQL database, all containerized with Docker for easy deployment and scalability.

## 6. Functional Requirements
*   **FR-001: Task Creation:** The system shall allow a user to create a new task with a title (mandatory) and an optional description.
*   **FR-002: Task Listing:** The system shall display a list of all existing tasks, showing at least the title and current status.
*   **FR-003: Task Detail View:** The system shall allow a user to view the full details of a single task, including title, description, and status.
*   **FR-004: Task Editing:** The system shall allow a user to update the title, description, and status of an existing task.
*   **FR-005: Task Status Toggling:** The system shall allow a user to toggle a task's status between "pending" and "completed".
*   **FR-006: Task Deletion:** The system shall allow a user to permanently delete an existing task.
*   **FR-007: Task Filtering by Status:** The system shall allow a user to filter the list of tasks to show only "pending" tasks, only "completed" tasks, or all tasks.

## 7. Non-Functional Requirements
*   **NFR-001: Performance:**
    *   The application should load within 3 seconds on a standard broadband connection.
    *   API responses for task CRUD operations should occur within 500ms under normal load.
*   **NFR-002: Usability:** The user interface shall be intuitive, consistent (leveraging Clarity Design System), and easy to navigate for users with basic computer literacy.
*   **NFR-003: Reliability:** The system shall have an uptime of at least 99.9% (excluding planned maintenance).
*   **NFR-004: Scalability:** The backend API and database architecture should be capable of supporting an increase in task data and concurrent users without significant performance degradation.
*   **NFR-005: Maintainability:** The codebase (frontend and backend) shall adhere to established coding standards and best practices, facilitating easy updates and feature additions.
*   **NFR-006: Extensibility:** The architecture shall be designed to easily incorporate future features like user authentication, categories, and due dates.
*   **NFR-007: Security (MVP Scope):**
    *   All data transfer between frontend and backend shall use HTTPS.
    *   Backend API shall implement basic input validation to prevent common data integrity issues. (Note: No user authentication for MVP).
*   **NFR-008: Responsiveness:** The UI shall be fully responsive, providing an optimal viewing and interaction experience across various devices (desktop, tablet, mobile).

## 8. Epic Stories

### Epic 1: Core Task Management
**Epic Description:** This epic encompasses all essential functionalities for users to create, view, modify, and remove their tasks from the system. It forms the backbone of the To Do List application.
**Business Value:** Provides users with the fundamental tools to manage their tasks, directly addressing the core problem of scattered and unmanaged obligations, thereby enhancing productivity and organization.
**Acceptance Criteria:**
*   Users can successfully perform CRUD operations on tasks.
*   All tasks are persistently stored and retrieved from the database.
*   API endpoints are functional and return appropriate responses.

**User Stories:**
-   **US-001:** Create New Task
    -   **As a** busy individual
    -   **I want to** quickly add a new task with a title and an optional description
    -   **So that** I don't forget important items and can centralize my responsibilities.
    -   **Acceptance Criteria:**
        -   [ ] The system provides a form to input task title and description.
        -   [ ] A task title is mandatory; description is optional.
        -   [ ] Upon submission, the new task appears in the task list with a default "pending" status.
        -   [ ] The backend API successfully stores the new task.
    -   **Story Points:** 5
    -   **Priority:** High

-   **US-002:** View All Tasks
    -   **As a** busy individual
    -   **I want to** see a clear list of all my tasks
    -   **So that** I can get an overview of my current commitments.
    -   **Acceptance Criteria:**
        -   [ ] The main view displays a list of all tasks.
        -   [ ] Each task in the list shows its title and current status.
        -   [ ] The list is retrieved from the backend API.
    -   **Story Points:** 3
    -   **Priority:** High

-   **US-003:** View Single Task Details
    -   **As a** busy individual
    -   **I want to** be able to click on a task to see its full details
    -   **So that** I can review all information related to a specific task.
    -   **Acceptance Criteria:**
        -   [ ] Clicking a task in the list navigates to a detail view for that task.
        -   [ ] The detail view displays the task's title, description, and status.
        -   [ ] The details are retrieved from the backend API.
    -   **Story Points:** 3
    -   **Priority:** Medium

-   **US-004:** Update Task Details
    -   **As a** busy individual
    -   **I want to** modify the title or description of an existing task
    -   **So that** I can correct errors or add more context to my tasks.
    -   **Acceptance Criteria:**
        -   [ ] The task detail view provides an option to edit the task.
        -   [ ] An editable form pre-fills with current task data.
        -   [ ] Upon saving changes, the task details are updated in the list and detail view.
        -   [ ] The backend API successfully updates the task in the database.
    -   **Story Points:** 8
    -   **Priority:** High

-   **US-005:** Delete Task
    -   **As a** busy individual
    -   **I want to** remove a task that is no longer relevant
    -   **So that** my task list remains clean and focused on current priorities.
    -   **Acceptance Criteria:**
        -   [ ] The task detail view provides an option to delete the task.
        -   [ ] A confirmation prompt is displayed before permanent deletion.
        -   [ ] Upon confirmation, the task is removed from the list and the database.
        -   [ ] The backend API successfully deletes the task.
    -   **Story Points:** 5
    -   **Priority:** High

### Epic 2: Task Status and Filtering
**Epic Description:** This epic focuses on allowing users to manage the completion status of their tasks and to organize their view of tasks based on this status.
**Business Value:** Enables users to track progress and quickly identify what tasks are pending versus completed, improving workflow efficiency and providing a sense of achievement.
**Acceptance Criteria:**
*   Users can easily mark tasks as complete or pending.
*   Users can filter their task list by completion status.

**User Stories:**
-   **US-006:** Toggle Task Status
    -   **As a** busy individual
    -   **I want to** easily mark a task as "completed" or revert it to "pending"
    -   **So that** I can track my progress and update my task list efficiently.
    -   **Acceptance Criteria:**
        -   [ ] Each task in the list view has an interactive element (e.g., checkbox, toggle button) to change its status.
        -   [ ] Changing the status is reflected immediately in the UI.
        -   [ ] The backend API successfully updates the task's status.
    -   **Story Points:** 5
    -   **Priority:** High

-   **US-007:** Filter Tasks by Status
    -   **As a** busy individual
    -   **I want to** filter my task list to show only pending, completed, or all tasks
    -   **So that** I can focus on specific categories of tasks without distraction.
    -   **Acceptance Criteria:**
        -   [ ] The task list view includes filtering options (e.g., dropdown, toggle buttons for "All", "Pending", "Completed").
        -   [ ] Selecting a filter immediately updates the displayed task list to show only matching tasks.
        -   [ ] The filtering logic can occur on the frontend or be supported by backend API query parameters.
    -   **Story Points:** 8
    -   **Priority:** Medium

## 9. User Interface Requirements
*   **UI-001: Clarity Design System Adherence:** The UI shall strictly adhere to the VMware Clarity Design System for all components (buttons, forms, tables, icons, layout), ensuring a consistent and professional look and feel.
*   **UI-002: Responsive Design:** The interface shall adapt gracefully to various screen sizes, from desktop monitors to mobile devices, maintaining full functionality and usability.
*   **UI-003: Task List View:** A clean, scannable list view for tasks, allowing easy identification of task titles and statuses.
*   **UI-004: Task Form:** An intuitive form for adding and editing tasks, with clear labels and validation messages.
*   **UI-005: Navigation:** Simple, clear navigation elements to access different views (e.g., "All Tasks", "Add New Task" or a unified view with filters).
*   **UI-006: Feedback:** Provide clear visual feedback for user actions (e.g., successful task creation, loading states, error messages).

## 10. Technical Requirements
*   **TR-001: Frontend Framework:** Utilize Angular (v12+) and TypeScript for building the Single-Page Application.
*   **TR-002: UI Library:** Integrate and utilize the Clarity Design System (v8+) for all UI components.
*   **TR-003: Backend Language & Framework:** Develop the RESTful API using Python and Flask (with Flask-RESTful).
*   **TR-004: Database:** Employ PostgreSQL as the primary database for persistent storage of task data.
*   **TR-005: ORM:** Use SQLAlchemy for object-relational mapping between the Python backend and PostgreSQL.
*   **TR-006: API Communication:** Frontend shall communicate with the backend via RESTful API calls over HTTP/HTTPS, exchanging data in JSON format.
*   **TR-007: Containerization:** Both the Angular frontend (served by Nginx) and the Flask backend shall be containerized using Docker.
*   **TR-008: Error Handling:** Implement global error handling on both frontend (HTTP interceptors) and backend to gracefully manage and report API errors.

## 11. Success Metrics & KPIs
*   **MVP Adoption:** % of internal testers successfully completing key task management workflows (create, complete, delete).
*   **Task Engagement Rate:** Number of tasks created, updated, and completed per unique user per week.
*   **Backend API Latency:** Average response time for API endpoints (target < 500ms).
*   **Frontend Load Time:** Average initial page load time (target < 3 seconds).
*   **Bug Count (Post-MVP Internal Launch):** Number of critical/high severity bugs reported per week.

## 12. Risk Assessment
*   **RA-001: Scope Creep (High):** Tendency to add features beyond MVP (e.g., authentication, categories, due dates).
    *   **Mitigation:** Strict adherence to the MVP definition and clear communication of scope boundaries. Ruthless prioritization.
*   **RA-002: Performance Bottlenecks (Medium):** Slow UI or API response times with increasing data/users.
    *   **Mitigation:** Regular performance testing, API optimization, efficient database queries, proper indexing, lazy loading for frontend modules.
*   **RA-003: Technical Debt (Medium):** Rushing development leading to unmaintainable code.
    *   **Mitigation:** Enforce coding standards, code reviews, allocate time for refactoring, utilize linters.
*   **RA-004: UI/UX Complexity (Medium):** Clarity Design System learning curve or misapplication leading to poor UX.
    *   **Mitigation:** Experienced Angular/Clarity developers, regular design reviews, adherence to Clarity guidelines.
*   **RA-005: Security Vulnerabilities (Low for MVP, High for future):** Lack of authentication in MVP makes it insecure for sensitive data.
    *   **Mitigation (for MVP):** Clearly communicate "no authentication" limitation. Ensure basic input validation. Plan for authentication as a primary future feature.
*   **RA-006: Environmental Setup Complexity (Medium):** Issues with Dockerizing and deploying the multi-service application.
    *   **Mitigation:** Detailed `docker-compose.yml` and deployment instructions, thorough testing of deployment scripts.

## 13. Timeline & Milestones
*(Note: This timeline is for the MVP and is high-level; specific dates will be refined during sprint planning.)*

*   **Phase 1: Planning & Setup (Week 1)**
    *   Complete Analysis, Architecture, Tech Stack Documents (Done).
    *   **Milestone:** PRD Finalized (Current).
    *   Initial project setup and repository creation.
*   **Phase 2: Backend Development (Weeks 2-3)**
    *   Set up Flask project, SQLAlchemy, and PostgreSQL.
    *   Develop Task API (CRUD, Status Toggle) endpoints.
    *   Implement backend unit tests.
    *   **Milestone:** Backend API Ready.
*   **Phase 3: Frontend Development (Weeks 4-5)**
    *   Integrate Angular Clarity boilerplate.
    *   Develop Task List, Detail, Create, Edit components.
    *   Integrate with backend API using Angular services.
    *   Implement frontend unit tests.
    *   **Milestone:** Frontend UI & API Integration Complete.
*   **Phase 4: Integration, Testing & Refinement (Week 6)**
    *   End-to-end testing of full application flow.
    *   Bug fixing and performance optimization.
    *   Internal User Acceptance Testing (UAT).
    *   **Milestone:** MVP Testing & Bug Resolution Complete.
*   **Phase 5: Deployment & Initial Launch (Week 7)**
    *   Finalize Docker configurations.
    *   Deploy to a staging/production environment.
    *   Post-launch monitoring.
    *   **Milestone:** MVP Deployment & Initial Launch.

## 14. Dependencies & Assumptions
*   **DEP-001:** Availability and stability of the backend API for all frontend operations.
*   **DEP-002:** The Clarity Design System components meet the majority of UI/UX needs without extensive custom styling.
*   **DEP-003:** Developers have expertise in Angular, TypeScript, Python, Flask, Docker, and SQL/PostgreSQL.
*   **ASM-001:** For the MVP, user authentication/authorization is explicitly out of scope, and all tasks are considered publicly accessible within the application context.
*   **ASM-002:** The development environment (Node.js, Angular CLI, Python, Docker) is stable and correctly configured.
*   **ASM-003:** Internet connectivity is consistently available for external library downloads during development and for users accessing the deployed application.
*   **ASM-004:** The chosen technology stack (Angular, Flask, PostgreSQL) is suitable and performant for the MVP requirements.

