The software development lifecycle (SDLC) is the structured process for creating software, from idea to retirement. Its phases are commonly described as initiation and requirements, design, development (coding), testing, deployment and implementation, operations and maintenance, and disposal. The central security lesson is that security must be built in from the start, because fixing flaws late in the lifecycle is far more expensive and less effective than preventing them. A design flaw found in production can require rearchitecting; the same flaw found in a design review costs a meeting.
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