1. To give an account of in speech or writing.
2. To convey an idea or impression of; characterize
3. To represent pictorially; depict
4. To trace the form or outline of
   
   

1. To make plain or comprehensible.
2. To define; expound:
3. 1. To offer reasons for or a cause of; justify
   2. To offer reasons for the actions, beliefs, or remarks of (oneself).

The case study should not only describe but also explain the building and its structural system.

Your information sources will probably offer much more description than explanation. You will need to formulate the explanation based on the information available, even though that information may be incomplete, and the explanation may not be certain. Justify the explanation as best you can.

For example, if you find that a building has a braced frame latereral resisting system, form an explanation of why a braced frame was chosen, based on everything that you know about the building.

If the information sources do not tell what the lateral resisting system is, then form an explanation of what you think the system is, and why, based on the information available.