Three software development patterns mashed together.
<p><a href="//commons.wikimedia.org/wiki/User:Beao" title="User:Beao">Beao</a>
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Old waterfall: Paul Smith
<p><a href="//commons.wikimedia.org/wiki/File:Waterfall_model_revised.svg" title="File:Waterfall model revised.svg">File:Waterfall model revised.svg</a>
</p><p><a href="//commons.wikimedia.org/wiki/File:Rapid_application_software_development.svg" title="File:Rapid application software development.svg">File:Rapid application software development.svg</a>
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<a href="//commons.wikimedia.org/wiki/File:Software_Development_Spiral.svg" title="File:Software Development Spiral.svg">File:Software Development Spiral.svg</a>