A computer method and apparatus for visual modeling software programs represents a topic by providing a respective topic diagram. The topic diagram is non-editable and has non-persisting notation data. The topic diagram demonstrates a respective set of relationships between one or more given elements representative of the subject topic. The topic diagram is derived based on a query which saves search criteria and information that enables an editor to generate the diagram notation data. There are different topic providers for different queries. A topic service manages the topic providers and processes client calls (requests) regarding specific context and query. Queries are end-user customizable and are extensible per topic.