Simple report for our KPI

Hi

I'm trying to generate a report but am not yet able to get what i want.

I would like the report/chart to show for each technician how many of the completed requests were completed on time and how many are overdue for our specified date period.

So essentially Im looking for something that shows each request and then a total sum (completed request date > due date = x ), (completed requests date < due date = y) percentage of x and y for our KPI.

Forgive me if this is really simple, as i have only been using this system a short time, i do not know it too well.
i hope i made sense, so if anyone can help me out or post ~what i need.