@Dave442 Are you talking about a keyword system kind of like this?
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Yes, like that. But say at the car show there is an Impala I like and take 10 shots, however my Keywords on the import are only Car Show and the name of that car show. When I select my favorite shot of the Impala I would add that name to the Keywords. Later I may need the shot of an Impala and may come up with three from different shows, but then I can go to each of the Folders that are by date and see more shots.
Basically my Keywords are like part numbers and I am trying to balance the quantity of part numbers in my system so that it is manageable and at the same time is expandable to meet new business opportunities.
I use the product part number analogy as that is where I have had experience. The best thing is to spend time initially deciding on the best way to lay things out so it will be easy to use and will hold up to time and size. My current setup had to go through a couple iterations and combines in any number of tips and pointers from other LR users. There is certainly room for improvement.
Right now I know things are easy enough that a first time LR user could open my LR and do an Import and could find photos using Keywords with about five minutes of instruction. That's also important to me so that if I don't use the program for some time I can quickly get up and running again.
As a final note, as we near 2016 it's time for me to update the copyright metadata that I apply during Import. And make a 2016 Folder with its one photo so that LR will automatically place 2016 photos inside that directory.