Because of this payroll systems are fraught with implementation problems, particularly in government, where this type of rules exist. In the past I kept a log

Because of this payroll systems are fraught with implementation problems, particularly in government, where this type of rules exist. In the past I kept a log of IT project failures as I come across them. There are a few bad payroll system rollouts. http://it-project-failures.blogspot.com/ http://it-project-failures.blogspot.com/ The Queensland Health Payroll system blew up a political storm because of implementation issues. The cost of the blowout? $219M. http://www.couriermail.com.au/news/queensland/health-pay-bungle-bill-soars/story-e6freoof-1226178920932 http://www.couriermail.com.au/news/queensland/health-pay-bun... In fact there was an inquiry into what went so badly wrong http://www.insightcp.com/blog/why-sap-hrpayroll-projects-fail#comment-72 http://www.insightcp.com/blog/why-sap-hrpayroll-projects-fai... Payroll systems should never be migrated wholesale. They should be scriptable, for instance pay masters should be able to script the computations to assist them. Anybody else interested in IT project morbidity could also look at http://delicious.com/search?p=itfailures http://delicious.com/search?p=itfailures and http://delicious.com/tag/deathmarch http://delicious.com/tag/deathmarch