---
title: "Simple Todo Application - Requirements Specification"
version: "1.0"
date: "2025-12-05"
author: "System Engineering Team"
project: "SimpleApp"
status: "Draft"
format: "iso-29148-tables"
---

# Simple Todo Application - Requirements

## Functional Requirements

| Requirement ID | Requirement Text | Priority | Rationale |
|---|---|---|---|
| REQ-F-001 | The application shall allow users to create new todo items with a title and optional description. | High | Core CRUD functionality required for basic operation |
| REQ-F-002 | The application shall display all created todo items in a list format with their current status. | High | Essential for user interaction and visibility |
| REQ-F-003 | The application shall provide functionality to mark a todo item as complete or incomplete with a toggle action. | High | Core feature for tracking todo progress |
| REQ-F-004 | The application shall allow users to delete todo items from the list permanently. | Medium | Important for lifecycle management |
| REQ-F-005 | The application shall allow users to edit the title and description of existing todo items. | Medium | Important for flexibility and error correction |

## Non-Functional Requirements

| Requirement ID | Requirement Text | Priority | Rationale |
|---|---|---|---|
| REQ-NF-006 | The application shall persist all todo items to a JSON file so that data remains available after application restart. | High | Data persistence requirement for production use |
| REQ-NF-007 | The application shall validate that todo titles are not empty and are no longer than 200 characters. | High | Data quality and constraint validation |
| REQ-NF-008 | The application shall complete all todo operations (create, read, update, delete) within 100 milliseconds. | Medium | Performance requirement for user experience |
| REQ-NF-009 | The application shall implement proper error handling with descriptive error messages for all operations. | High | User support and reliability requirement |
| REQ-NF-010 | The application shall provide a simple command-line interface with clear menu options and status feedback for user actions. | High | Usability and user experience requirement |