Let's say that I want to write several programs that use a particular file, so I want to package up all the code that refers to that file in a reusable module that I can "do" from the various programs that use that file. To make the source code of the various programs easier to understand, I want to apply some naming conventions to the data items in that common file. I personally like prefixes, for reasons not relevant at this time. So, I could do something like this: PROPMAST-ID: "" PROPMAST-ADDRESS: "" PROPMAST-OWNER: "" etc. OR, I could do something like this: PROPMAST: make object! [ ID: "" ADDRESS: "" OWNER: "" etc. ] and then refer to the items as PROPMAST/ID, PROPMAST/ADDRESS, etc. I believe I understand HOW to do this (I have done it in at least one situation), but I don't understand WHY I might choose one approach over the other. Is there some reason why one way might be preferred/recommended/better? Thank you.