19. Expert users and vocabulary

• Best place to look for answers about the design is in the application domain.

• Listen to someone who is an expert user of the system.

• Listen to someone who is a somewhat dissatisfied user of the current system being replaced.

• Note the vocabulary they use:

  • Nouns will often correspond to the classes and objects needed.

  • Verbs may denote operations on objects

  • Verbs may also suggest well-known design patterns, such as "iterate" or "commit".

  • Some adjectives can also represented useful classes, consider
    "storable", "concurrent", "registered", and "bounded".