The 6 Essential Stages of Software Development Life Cycle

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You forgot the final step: Never actually finish software, allow it to deprecate, and then fire the staff. New opening for lower pay and a "unicorn" that can "improve" legacy website...

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I’ve seen people using another approach - implement, deploy to production, fix snafu, deploy, fix, deploy, fix, deploy, fix, deploy, fix, huff, puff.

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If only software was a linear process like this.

We start with a general idea what we want to do but you always learn new things while coding and testing. Requirements also change over time. Coding and testing often evolves in a tight loop with many local iterations until the code is made available to others to test. Once others are involved in the testing, an outer loop is formed to decide what to fix. As systems grow over time they create additional requirements for how to modify the system.

The further out into the future you project the more uncertainty there is. A month or two of activities for a small team can be projected with great effort. Projecting out a few weeks ahead is more practical.

What did you use to create this diagram?

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