Not just about GIGO.
User must have given the IT personnel the system user requirements.
User is suppose to do test run; before and after implementing the new system, and compare the results. Print statistic report from old system, then migrate data to new system, then print report from new system, then compare with the report from old system.
First scenario: Users didnt compare the before and after results, ------> users testing failure------> users bochap.
Second scenario: Users compared the before and after results and found no discrepencies in the report between old and new system ----------> statistics had been wrong in the old system --------> statistics maybe wrong before 2008 as well
So lame to blame IT system.