Hello! Im trying to figure out the difference between a UML conceptual model of a system and a UML class diagram. ANy ideas? Thanks, Mcihele

Look up the 'System Development Life-Cycle'. A UML Class diagram shows the relationship/s between the Classes, their Attributes(name, address etc) & Operations(add new, remove etc). You will typically begin the process of data modelling by developing a conceptual data model for the sytem being replaced, if a system exists, this is essential for planning the conversion of the current files or database into the database of the new system. You will build your conceptual model by collecting data from interviews, sampling documentation and other fact finding methods, you will then start drawing up your 'Entity Relationship Diagram' or 'Use Case Diagram' once you have these you can then look at your designing your 'Class Diagram' Hope this helps. it's difficult to explain. Look up the types of diagrams I suggest on the web, they should give you a better idea. Also look up 'Systems Analysis & Design' M