## How do we select a decomposition?

- We determine the desired criteria
- We select a decomposition (design) that will achieve those criteria

## In theory, that is; in practice, it’s hard to

- Determine the desired criteria with precision
- Tradeoff among various conflicting criteria
- Figure out if a design satisfies given criteria
- Find a better one that satisfies more criteria

## In practice, it’s easy to

- Build something designed pretty much like the last one
- This has benefits, too: understandability, properties of the pieces, etc.

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