Organize your results into the following categories and analyze them as follows:
Artifacts created or modified in normal/expected ways. Compare these with your future development plans to ensure that you are continuing to support the normal use of your product. As the old saying goes, "If it ain't broken, don't fix it."
Artifacts created or modified in surprising ways. These are your greatest areas of opportunity to learn from your customers how your product can be extended to meet their needs or tap new markets.
Artifacts not created or used. These represent areas in which your total offering can be improved or simplified. For example, it could be that your product is just fine but your education and/or reference manuals are lousy. Alternatively, it could mean that your product is over engineered and that features can be removed.