use cases

Dear all:

use cases can be one of the corner stones of our efforts.
In our group at DC we had a discussion about what we can do here.
In order to make a decision, we would like to know what these use cases should 
look like and how to deal with them:

- size of the ontology
- domain of the ontology
- its relation to upper ontologies (if at all?)
- typical problems to be solved with: semantic integration, intelligent 
information retrieval, knowledge modelling support

- time schedule for the use cases

- are there any tools recommended to be used in formulating and using the 
ontologies?

Regards

Ruediger