In my previous life as a manager, I used a spreadsheet for each lab section that had items on it like: run controls, run proficiency samples, direct observation, etc. As I do my job I would just document some of these items over time. As I was in the lab for any reason--I was always aware (observing) of what the techs were doing. You probably already track proficiency tests for each area so just transpose the info to the spreadsheet (better yet, tie the sheets to one another). Observation, about once a month I would complete the spreadsheet for who was working in each section--over the course of a year, it was complete.