Likewise with pertinent authors in the subject areas. This gives the client access to specialists and analytical authority beyond the scope of the searcher. I do not include an analytical memo with each deliverable. Sometimes there isn't time for this degree of post-processing. Sometimes I deliver this information verbally.
Some deliverables are far too simple or data-oriented to warrant such an attachment.
On the other hand, some deliverables cry out for a good cover memo. A 30-page or longer document requires more than headers to assist the reader in timely digestion. This sort of value-added tool is a kind of handshake between my client and me. It also helps me to form the shelf on which I store this information. The analytical memo concludes a process I have started with sleuthing.