November 2010

Aggregation verses Composition

November 10, 2010 0 comments

When teaching software design skills I often get asked what the difference is between aggregation and composition. My answer: parking lots. Parking lots aggregate cars. A parking is still a parking lot even if there are no cars on it. It is a zero-to-many relationship and what is being aggregated is optional. A car is […]

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First Seek to Understand

November 2, 2010 0 comments

Sometimes I like to start a project by doing a few hours of design and then spend the rest of an iteration building a proof of concept. Oftentimes I can get a tremendous amount of functionality roughed out in a system very quickly and then spend the next several iterations making it supportable and maintainable. […]

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