There will always be a need for reports that are critical for the executives and may have been missed during the previous phases. Watch out for such reports; some requests may be due to other system issues, such as a list of the invoices that had tax missing. Have a resource to respond to such requests. The guidelines given in Chapter 6, Reporting and BI will help in minimizing the need for these demands and will help you in responding to them.
As mentioned in Chapter 12, Go-live Planning, you will need resources to respond to the security-related issues, and then lock down access to the system.