  The well-known Task Elimination redesign principle suggests to remove
unnecessary tasks from a process to improve on time and cost. Although there
seems to be a general consensus that removing work can only improve the
throughput time of the process, this paper shows that this is not necessarily
the case by providing an example that uses plain M/M/c activities. This paper
also shows that the Task Automation and Parallelism redesign principles may
also lead to longer throughput times. Finally, apart from these negative
results, the paper also show under which assumption these redesign principles
indeed can only improve the throughput time.
