What is the System Development Life Cycle (SDLC), and what are its phases? This ISC-focused lesson walks through the seven phases of the SDLC using a mobile food-ordering app example — planning, analysis, design, development, testing, deployment, and maintenance — including the main deployment strategies like big bang, gradual, A/B, and blue-green. Built for accounting students and CPA, CMA and EA candidates studying information systems and controls.

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Video Timeline & Key Concepts:
0:00 — Introduction to the System Development Life Cycle
1:52 — Planning: scope, objectives, requirements, feasibility
2:45 — Analysis: gathering detailed functional requirements
3:37 — Design: architecture, user interface, and database schema
4:21 — Development: building the front-end and back-end
5:01 — Testing: manual, automated, and user acceptance testing
5:34 — Deployment strategies: big bang, gradual, A/B, blue-green
9:22 — Maintenance: bug fixes, updates, and monitoring

Frequently Asked Questions:

What is the System Development Life Cycle?

The SDLC is a structured, repeatable process for planning, designing, building, testing, deploying, and maintaining software systems.

What are the seven phases of the SDLC?

The phases are planning, analysis, design, development, testing, deployment, and maintenance.

What is the difference between the analysis and design phases?

Analysis defines what the system must do by gathering functional requirements, while design determines how it will do it through architecture, interfaces, and the database schema.

What are the main software deployment strategies?

Common strategies include big bang, gradual or ramped rollout, A/B testing, and blue-green deployment, which differ in risk and how quickly the change reaches all users.

Why is the maintenance phase important?

Maintenance provides ongoing bug fixes, updates, and performance monitoring so the system keeps meeting user needs and adapts to changing requirements.

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