Introduction to Software Development
Key concepts, phases, roles, and best practices
1. What Is Software Development?
| Aspect |
Description |
| Definition |
The systematic process of designing, creating, testing, and maintaining software applications or systems. |
| Goal |
Transform user needs or business requirements into reliable, functional, and maintainable software. |
| Scope |
Includes everything from a simple script to large, distributed enterprise systems. |
| Disciplines |
Requirements engineering, design, coding, testing, deployment, maintenance, and project management. |
2. Core Concepts & Terminology
| Term |
Meaning |
| Algorithm |
Step‑by‑step procedure for solving a problem. |
| Data Structure |
Organized way to store and access data (e.g., arrays, linked lists, trees). |
| API (Application Programming Interface) |
Set of rules that allows different software components to communicate. |
| Framework |
Reusable, semi‑complete platform that provides generic functionality (e.g., React, Spring). |
| Version Control |
System for tracking changes to code (Git, Subversion). |
| CI/CD |
Continuous Integration / Continuous Delivery – automated build, test, and deployment pipelines. |
| Technical Debt |
Future cost incurred by shortcuts or sub‑optimal solutions taken today. |
3. Software Development Life Cycle (SDLC)
| Phase |
Primary Activities |
Typical Deliverables |
| 1. Planning / Feasibility |
Stakeholder interviews, market analysis, risk assessment. |
Project charter, feasibility report. |
| 2. Requirements Gathering |
Elicit functional & non‑functional requirements, create user stories or use cases. |
Requirements Specification (SRS), backlog. |
| 3. Design |
Architecture selection, UI/UX mockups, database schema, component diagrams. |
Architecture diagram, UI prototypes, design docs. |
| 4. Implementation (Coding) |
Write source code, adhere to coding standards, perform peer reviews. |
Source code repository, build scripts. |
| 5. Testing |
Unit, integration, system, acceptance, performance, security testing. |
Test plans, test cases, defect reports. |
| 6. Deployment |
Release to production environment, configure infrastructure, roll‑back plan. |
Deployment scripts, release notes. |
| 7. Maintenance |
Bug fixes, enhancements, performance tuning, security patches. |
Updated documentation, versioned releases. |
Note: Models such as Waterfall, Iterative, Spiral, and Agile define how these phases are organized and revisited.
4. Popular Development Methodologies
| Methodology |
Key Characteristics |
Typical Use‑Cases |
| Waterfall |
Linear, sequential phases; heavy documentation. |
Regulated industries, fixed‑scope projects. |
| Agile (Scrum, Kanban) |
Incremental delivery, frequent feedback, adaptable scope. |
Rapidly changing requirements, product‑centric teams. |
| DevOps |
Combines development & operations; emphasizes automation & monitoring. |
Cloud‑native services, continuous delivery pipelines. |
| Lean |
Eliminate waste, focus on value‑stream mapping. |
Start‑ups, startups, teams seeking efficiency. |
5. Typical Roles in a Development Team
| Role |
Primary Responsibilities |
| Product Owner / Business Analyst |
Define product vision, prioritize backlog, liaise with stakeholders. |
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