1. According to Sommerville, what are the 3 different strategies for software change? (1/2 credit for 2.)

• Software maintenance. Fixing bugs and adding features, without changing overall structure of the software.
• Architectural transformation. Making fundamental changes in the structure of the software.
• Software re-engineering. The basic structure is left unchanged, but the software is modified to make it easier to understand and change.

2. Given a list of system components, what are two ways to represent a specific system version?

• As a thread running through a component (or dependency) tree. This is a visual representation.
• As a list that states the specific edit version of each component that is included in the system version. Not every component needs to be included.