Need help with the following questions on input oriented technical efficiency and output oriented technical efficiency measure and following questions that are related.

1. What is benchmarkingbased evaluation of performance?
2. What is efficiency?
3. What are the various measures of efficiency?
4. How is this optimization based technique superior to standard ratio analysis for performance evaluation?
5. How is this technique different from standard Regression Analysis used for various analysis?
6. How do the various measures of Efficiency varyfrom each other?
7. How does one choose the correct metric for performance evaluation?
8. What are the theoretical/empirical models for this benchmark based performance evaluation?
9. What kind of data is required for running this kind of analytics?
10. How is the information on prices of inputs and output(s)important for this analysis?
11. What recommendation can one give on the basis of results of the analysis?
12. What are the factors explaining the variation in efficiency score (of any kind) across DMUs?
13. What are the limitations of this technique?
14. How can one consult a client using this analytical tool?