Fill in the blank:

1. A ___________________ has a simple structure that guides designers and users alike, making it an excellent selection style for many applications.
2. ___________________can be created with paper and pencil, word processors, or slide-show presentation software.
3. The ___________________are interface generators, sometimes called user-interface management systems or model-based building tools.
4. ___________________is a set of tools which captures the users' patterns of activity.