Requirements

Let's build a system that empowers teachers to create and manage learning content effectively. Imagine a school district needing a centralized platform where educators can upload, organize, and share educational resources with their students. This system must handle various content types (text, videos, quizzes, PDFs), support collaborative content creation, and ensure content is easily discoverable. We want a design that's flexible enough to accommodate new content types and features without requiring significant code changes. The core idea revolves around teachers being able to upload and manage content and assign it to different student groups or courses. This system needs to support features like versioning, approval workflows, and access control to ensure content quality and relevance. Think Google Classroom meets a sophisticated document management system tailored for education. # Requirements ## Functional Requirements 1. **Teacher Authentication and Authorization:** * Teachers must be able to log in securely. * Role-based access control (RBAC) must be implemented to restrict access based on teacher roles (e.g., administrator, content creator, reviewer). 2. **Content Uploading:** * Support uploading different content types: * Text-based documents (plain text, Markdown, HTML). * Video files (MP4, MOV). * Audio files (MP3, WAV). * PDF documents. * Interactive quizzes (various question types). * Links to external resources (YouTube videos, websites). * Implement a mechanism to handle large file uploads efficiently. * Provide progress updates during the upload process. * Allow metadata to be associated with each content item (title, description, keywords, subject, grade level). 3. **Content Organization:** * Teachers should be able to organize content into courses, modules, and folders. * Support hierarchical folder structures. * Allow content to be tagged with relevant keywords. 4. **Content Editing:** * Provide a rich text editor for creating and editing text-based content. * Allow teachers to embed videos, images, and other multimedia elements into their content. * Support collaborative editing with version control. 5. **Content Versioning:** * Automatically track changes to content and maintain a history of versions. * Allow teachers to revert to previous versions of content. * Implement a mechanism to compare different versions of content. 6. **Approval Workflow:** * Implement an approval workflow for content publication. * Allow designated reviewers to approve or reject content submissions. * Notify teachers of the status of their content submissions. 7. **Access Control:** * Allow teachers to control who can access their content (e.g., specific students, courses, or groups). * Implement fine-grained access control permissions (e.g., read-only, edit, comment). 8. **Search Functionality:** * Provide a search interface that allows teachers to quickly find content based on keywords, title, description, subject, or grade level. * Support full-text search within documents. 9. **Content Preview:** * Allow teachers to preview content before publishing it. * Provide different preview options for different content types. 10. **Content Assignment:** * Teachers should be able to assign uploaded content to a course. * Teachers should be able to assign uploaded content to specific student groups within a course. ## Non-Functional Requirements 1. **Thread Safety:** The system must be thread-safe to handle concurrent requests from multiple teachers uploading and editing content simultaneously. Focus should be on protecting shared resources (e.g., content storage, metadata indices) using appropriate synchronization mechanisms (e.g., locks, concurrent data structures). 2. **Extensibility:** The system should be designed to easily accommodate new content types, features, and integrations without requiring significant code changes. Use the Strategy pattern for content processing and handling. 3. **Modularity:** The system should be divided into loosely coupled modules with well-defined interfaces. This will improve maintainability, testability, and reusability of code. 4. **Testability:** The code should be designed to be easily testable, with clear separation of concerns and dependency injection. Unit tests should cover all critical components and functionalities. Integration tests should verify the interaction between different modules. 5. **Performance:** The system should provide acceptable performance for all operations, including content upload, search, and retrieval. Consider caching strategies (if relevant to the *class design*) to improve performance. Avoid excessive locking or contention that could degrade performance under high load. Focus on efficient algorithms for indexing and searching content. 6. **Security:** The system must protect against unauthorized access, data breaches, and other security threats. Implement proper authentication and authorization mechanisms. Sanitize user input to prevent cross-site scripting (XSS) and SQL injection attacks. Secure file uploads to prevent malicious code from being uploaded to the server. 7. **Scalability:** The system should be scalable to handle a growing number of teachers, students, and content items. Focus on designing components that can be easily scaled horizontally (e.g., using a distributed file storage system). 8. **Maintainability:** The code should be well-documented, easy to understand, and follow coding conventions. Use meaningful variable names and comments. Avoid code duplication and complexity. ## Core Entities 1. **User:** Represents a user of the system (e.g., teacher, student, administrator). Contains information such as user ID, username, password, roles, and permissions. 2. **ContentItem:** Represents a piece of learning content. Contains information such as content ID, title, description, content type, file path, metadata, and version history. 3. **Course:** Represents a course or subject. Contains information such as course ID, name, description, and list of associated content items. 4. **Module:** Represents a module within a course. Contains information such as module ID, name, description, and list of associated content items. 5. **Folder:** Represents a folder for organizing content. Contains information such as folder ID, name, and list of contained content items and subfolders. 6. **ContentType:** An enumeration or class representing different types of content (e.g., Text, Video, PDF, Quiz). Crucial for extensibility via the Strategy pattern. 7. **Role:** Represents a user role (e.g., administrator, content creator, reviewer). 8. **Permission:** Represents a permission that can be assigned to a role (e.g., upload content, edit content, approve content). 9. **Version:** Represents a specific version of a `ContentItem`. 10. **Assignment:** Represents an assignment of a `ContentItem` to a `Course` or `StudentGroup`. 11. **StudentGroup:** Represents a group of students.

Design Learning app (Design system where teachers can upload the content and stuedents can view that content.)

Requirements

Interview Simulation

Functional Requirements

💡 Interview Tip

Non-Functional Requirements

Core Entity Identification

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