Can the Annual Goal Rating depend on the monthly ratings?

Summary:

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I've requirement that:

A. Certain employees have monthly Objectives evaluations

B. Certain Employees have quarterly Objectives evaluations

All: employees have yearly evaluation including Objectives 50% and Competencies 50%

A. Yearly Objectives score for (A) = average score of all monthly evaluations/12

B. Yearly Objectives score for (B) = average score of all monthly evaluations/12

All: Yearly Overall calculation = Yearly Objectives Score + Competencies Score

Any Ideas or Advices?

Another Question:

Can Interim Performance Documents (Monthly or Quarterly) affect the Overall Score for the Main/Yearly performance document?

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