Review periods need to be set when establishing the implementation plan. Review periods can be set at either quarterly, bi-annually or annual installments. Alternatively, review changes can be made in incremented steps or via continuous improvement. Results from the review are calculated from the information gathered during the monitoring/evaluation phase. This may involve reviewing collected data as well as feedback from stakeholders. All changes made and their reasons for being made need to be documented as this information may be useful for future risk control measures or the development of the new implementation plan.