A memorandum or report is not necessary. I can stop at the production of tables. However, if you want testing of significant interactions and chose the SPSS tables format, a memorandum listing such interactions, or a full narrative report, is necessary. The primary advantage of SPSS tables is their presentation quality output.
If you choose the WinCross tables option, WinCross automatically conducts significance testing (you can choose any two of these levels: .01, .02, .05, .10, .20, .30, .40). Also, it is fast to run the table set with a different pair of significance levels. This would produce 2 identical table books, each testing at different levels of significance.
Some of my clients have had experience reading and interpreting significant interactions. While WinCross indicates statistical significance, these interactions should be screened for practical significance. Sometimes significance is reached with very small cell sizes. Sometimes there is an interaction, but when you look closer, it just doesn't seem to make sense or is impractical to describe in a useful (to the end client) manner.
If you are unsure of your analytical skills, then I can produce a memo or report to identify the more important interactions while discarding statistically significant but practically insignificant interactions.
In my experience, many non-profit and government institutions need a report or memorandum as part of the final work product. I have written many such reports for a variety of clients and needs.
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