# Product Requirements Document (PRD)
## TODO Application

**Version:** 1.0  
**Date:** 2026-03-20  
**Author:** OpenHands Team  
**Status:** Draft

---

## 1. Executive Summary

This document outlines the product requirements for a TODO application designed to help users manage their tasks efficiently. The application will provide a simple, intuitive interface for creating, organizing, and tracking tasks, enabling users to improve their productivity and stay organized.

---

## 2. Problem Statement

Users often struggle to keep track of their daily tasks, deadlines, and priorities. Existing solutions can be overly complex, lack essential features, or fail to provide a seamless user experience. There is a need for a straightforward, reliable TODO application that helps users manage their tasks without unnecessary complexity.

---

## 3. Goals and Objectives

### 3.1 Primary Goals
- Provide users with a simple and intuitive task management solution
- Enable users to create, read, update, and delete tasks (CRUD operations)
- Allow users to organize tasks by priority and due date
- Support task completion tracking

### 3.2 Success Metrics
- User adoption rate
- Task completion rate
- User retention (daily/weekly active users)
- User satisfaction score (NPS)

---

## 4. Target Audience

### 4.1 Primary Users
- **Individual users** seeking personal task management
- **Students** managing assignments and deadlines
- **Professionals** tracking work-related tasks

### 4.2 User Personas

#### Persona 1: Busy Professional
- **Name:** Alex
- **Age:** 32
- **Occupation:** Software Engineer
- **Needs:** Quick task entry, priority management, deadline tracking
- **Pain Points:** Forgetting tasks, missing deadlines, context switching

#### Persona 2: Student
- **Name:** Jordan
- **Age:** 21
- **Occupation:** University Student
- **Needs:** Assignment tracking, due date reminders, simple interface
- **Pain Points:** Overwhelming workload, difficulty prioritizing

---

## 5. Functional Requirements

### 5.1 Core Features

#### 5.1.1 Task Management
| ID | Feature | Description | Priority |
|----|---------|-------------|----------|
| F1 | Create Task | Users can create new tasks with a title and optional description | P0 |
| F2 | View Tasks | Users can view all their tasks in a list format | P0 |
| F3 | Edit Task | Users can modify task details (title, description, due date, priority) | P0 |
| F4 | Delete Task | Users can remove tasks from their list | P0 |
| F5 | Complete Task | Users can mark tasks as complete/incomplete | P0 |

#### 5.1.2 Task Organization
| ID | Feature | Description | Priority |
|----|---------|-------------|----------|
| F6 | Set Priority | Users can assign priority levels (High, Medium, Low) to tasks | P1 |
| F7 | Set Due Date | Users can set due dates for tasks | P1 |
| F8 | Filter Tasks | Users can filter tasks by status (all, active, completed) | P1 |
| F9 | Sort Tasks | Users can sort tasks by priority, due date, or creation date | P2 |

#### 5.1.3 User Experience
| ID | Feature | Description | Priority |
|----|---------|-------------|----------|
| F10 | Search Tasks | Users can search for tasks by title or description | P2 |
| F11 | Bulk Actions | Users can select multiple tasks for bulk delete or complete | P2 |
| F12 | Undo Action | Users can undo the last action (delete, complete) | P3 |

### 5.2 Future Features (Out of Scope for v1.0)
- User authentication and accounts
- Task categories/tags
- Recurring tasks
- Notifications and reminders
- Collaboration and task sharing
- Mobile application
- Calendar integration

---

## 6. Non-Functional Requirements

### 6.1 Performance
- Page load time: < 2 seconds
- Task operations (create, update, delete): < 500ms response time
- Support for up to 1000 tasks per user

### 6.2 Usability
- Intuitive interface requiring no training
- Accessible on desktop and mobile browsers (responsive design)
- Support for keyboard navigation
- WCAG 2.1 AA compliance for accessibility

### 6.3 Reliability
- 99.9% uptime availability
- Data persistence (tasks should not be lost)
- Graceful error handling with user-friendly messages

### 6.4 Security
- Data stored securely (local storage or encrypted database)
- Protection against XSS and CSRF attacks
- Input validation and sanitization

### 6.5 Compatibility
- Support for modern browsers (Chrome, Firefox, Safari, Edge)
- Responsive design for various screen sizes

---

## 7. Technical Requirements

### 7.1 Technology Stack (Recommended)
- **Frontend:** React, Vue.js, or vanilla JavaScript
- **Styling:** CSS/SCSS, Tailwind CSS, or similar
- **State Management:** Local state or Redux/Vuex for complex state
- **Storage:** LocalStorage for MVP, database for production
- **Build Tools:** Vite, Webpack, or similar

### 7.2 Architecture
- Single Page Application (SPA) architecture
- Component-based design
- RESTful API design (if backend is implemented)

### 7.3 Data Model

```
Task {
  id: string (UUID)
  title: string (required, max 200 characters)
  description: string (optional, max 1000 characters)
  priority: enum (HIGH, MEDIUM, LOW)
  dueDate: date (optional)
  completed: boolean
  createdAt: timestamp
  updatedAt: timestamp
}
```

---

## 8. User Interface Requirements

### 8.1 Main Views

#### 8.1.1 Task List View
- Display all tasks in a scrollable list
- Show task title, priority indicator, due date, and completion status
- Provide quick actions (complete, edit, delete) for each task
- Include filter and sort controls

#### 8.1.2 Task Creation/Edit Form
- Input field for task title (required)
- Text area for description (optional)
- Priority selector (dropdown or radio buttons)
- Date picker for due date
- Save and Cancel buttons

### 8.2 UI Components
- Task item card/row
- Add task button (floating action button or header button)
- Filter tabs (All, Active, Completed)
- Sort dropdown
- Search input
- Empty state illustration
- Loading indicators
- Confirmation dialogs for destructive actions

### 8.3 Design Principles
- Clean, minimalist design
- Clear visual hierarchy
- Consistent spacing and typography
- Intuitive iconography
- Responsive layout

---

## 9. User Stories

### 9.1 Epic: Task Management

| ID | User Story | Acceptance Criteria |
|----|------------|---------------------|
| US1 | As a user, I want to create a new task so that I can track things I need to do | - Can enter task title<br>- Task appears in list after creation<br>- Empty title shows validation error |
| US2 | As a user, I want to view all my tasks so that I can see what needs to be done | - All tasks displayed in list<br>- Tasks show title, priority, due date<br>- Empty state shown when no tasks |
| US3 | As a user, I want to edit a task so that I can update its details | - Can modify all task fields<br>- Changes persist after save<br>- Cancel discards changes |
| US4 | As a user, I want to delete a task so that I can remove completed or irrelevant items | - Task removed from list<br>- Confirmation dialog shown<br>- Action can be undone |
| US5 | As a user, I want to mark a task as complete so that I can track my progress | - Task shows completed state<br>- Can toggle completion status<br>- Completed tasks visually distinct |

### 9.2 Epic: Task Organization

| ID | User Story | Acceptance Criteria |
|----|------------|---------------------|
| US6 | As a user, I want to set task priority so that I can focus on important items | - Can select High/Medium/Low priority<br>- Priority visually indicated<br>- Default priority is Medium |
| US7 | As a user, I want to set due dates so that I can track deadlines | - Can select date from picker<br>- Due date displayed on task<br>- Overdue tasks highlighted |
| US8 | As a user, I want to filter tasks so that I can focus on specific items | - Can filter by All/Active/Completed<br>- Filter persists during session<br>- Count shown for each filter |

---

## 10. Wireframes

### 10.1 Main Task List View
```
+--------------------------------------------------+
|  TODO App                            [+ Add Task] |
+--------------------------------------------------+
|  [All] [Active] [Completed]     Sort: [Due Date▼] |
+--------------------------------------------------+
|  [ ] ● Buy groceries                    Mar 21    |
|      Get milk, eggs, and bread                    |
|                                    [Edit] [Delete]|
+--------------------------------------------------+
|  [✓] ○ Complete project report          Mar 20    |
|      Finish quarterly analysis                    |
|                                    [Edit] [Delete]|
+--------------------------------------------------+
|  [ ] ● Schedule dentist appointment     Mar 25    |
|                                    [Edit] [Delete]|
+--------------------------------------------------+

Legend: ● High Priority  ◐ Medium Priority  ○ Low Priority
        [ ] Incomplete   [✓] Complete
```

### 10.2 Add/Edit Task Modal
```
+------------------------------------------+
|  Add New Task                        [X] |
+------------------------------------------+
|  Title *                                 |
|  [________________________________]      |
|                                          |
|  Description                             |
|  [________________________________]      |
|  [________________________________]      |
|                                          |
|  Priority          Due Date              |
|  [Medium    ▼]     [Select date   📅]    |
|                                          |
|           [Cancel]  [Save Task]          |
+------------------------------------------+
```

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## 11. Release Plan

### 11.1 MVP (Version 1.0)
**Target Release:** Q2 2026

**Included Features:**
- Task CRUD operations (F1-F5)
- Priority and due date (F6-F7)
- Basic filtering (F8)
- Responsive design
- Local storage persistence

### 11.2 Version 1.1
**Target Release:** Q3 2026

**Included Features:**
- Task sorting (F9)
- Search functionality (F10)
- Bulk actions (F11)
- Undo functionality (F12)

### 11.3 Version 2.0
**Target Release:** Q4 2026

**Included Features:**
- User authentication
- Cloud sync
- Categories/tags
- Notifications

---

## 12. Risks and Mitigations

| Risk | Impact | Probability | Mitigation |
|------|--------|-------------|------------|
| Scope creep | High | Medium | Strict adherence to MVP features; defer non-essential features |
| Poor user adoption | High | Low | User research, usability testing, iterative improvements |
| Technical debt | Medium | Medium | Code reviews, documentation, refactoring sprints |
| Browser compatibility issues | Medium | Low | Cross-browser testing, progressive enhancement |

---

## 13. Open Questions

1. Should we implement user accounts in v1.0 or defer to v2.0?
2. What is the preferred technology stack for implementation?
3. Should we support offline functionality?
4. What analytics should we track for measuring success?

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## 14. Appendix

### 14.1 Glossary
- **Task:** A single item that needs to be completed
- **Priority:** The importance level assigned to a task
- **Due Date:** The deadline by which a task should be completed
- **CRUD:** Create, Read, Update, Delete operations

### 14.2 References
- [Nielsen Norman Group - Task Management UX](https://www.nngroup.com/)
- [Material Design Guidelines](https://material.io/design)
- [WCAG 2.1 Guidelines](https://www.w3.org/WAI/WCAG21/quickref/)

---

## 15. Document History

| Version | Date | Author | Changes |
|---------|------|--------|---------|
| 1.0 | 2026-03-20 | OpenHands Team | Initial draft |

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*This document is subject to change based on stakeholder feedback and technical discoveries during implementation.*