Failure Mode, Effect and Criticality Analysis (FMECA) is a prospective method for identifying and preventing potential error risks. Using FMECA, public health medical residents calculated a Risk Priority Number (RPN), or criticality, for each possible failure mode in cancer treatment prescription and administration. Each phase of the cancer treatment process had at least one critical step identified, and actions were developed to reduce the likelihood of the error occurring and/or to increase the likelihood of the error being detected.