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Summary Software Engineering Essentials - Study Guide

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An original study guide to software engineering: SDLC models, Agile and Scrum, SOLID principles, clean code, testing, CI/CD and DevOps. Includes comparison tables and practice questions. Ideal for SE courses and interviews.

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Software Engineering Essentials -
Study Guide
SDLC, Agile, design principles, testing, CI/CD and clean code - exam and
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Complete Study Guide | Key Concepts | Examples | Practice Questions

, 1. SDLC Models

The Software Development Life Cycle organises building software: requirements -> design -> implementation ->
testing -> deployment -> maintenance.

Model Idea Best when

Waterfall Sequential phases Fixed, well-understood requirements

Agile/Scrum Iterative sprints Changing requirements

Spiral Risk-driven loops Large, risky projects

V-Model Test level per dev level Safety-critical systems

DevOps Dev + ops merged, CI/CD Frequent releases needed


- Waterfall's weakness: late feedback - a misunderstood requirement costs the whole cycle.
- Scrum: sprints (1-4 weeks), daily standups, sprint review + retrospective.
- Kanban: continuous flow on a board; limit work-in-progress.
- Know one advantage and one disadvantage of each model for exams.




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October 2, 2026
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