Performance Audit
Generally, the NAO reviews the performance of the entities subject to its audit according to the following principles (three Es):
Effectiveness
Have the set goals been achieved and how does the actual result compare with the set goal?
Efficiency
Are the best quantitative and qualitative results obtained from available resources / public funds?
Economy
Are the resources used in the appropriate quality and quantity, at the right time and place and at the lowest possible cost to achieve the desired result?