Usability Memo Goals

I am testing for correct CPR (as evidenced by the correct follow through of directions on another individual), as well as effective compressions. I need to test multiple individuals on a variety of expertise levels on most of my instructions (maybe less of a focus on the 1-8 year old variation of CPR). Special considerations are timing; this needs to be done very quickly yet pretty accurately. Ideally I would like to test in a CPR certifying location with a dummy for the most accurate measure of results, however I will also test in a less formal scenario such as in my townhouse. I will tell the subjects to read the instructions and see how well they can follow through them, then ask for feedback on the strong and weak points of the instructions, and degrees of success measured in how many steps they take before messing up and where they express understanding or require clarification.
I'd prefer to use an official CPR dummy, but I may end up using a regular stuffed animal or doll. It has been suggested that I use two people at a time to 'mime' the instructions and evaluate the effectiveness of the follow-through. I'll probably use a questionnaire to evaluate as well.

My questionnaire will ask for an overall rating one to five with one being poor and five superior and for reasoning for the overall rating of my instruction set, requiring specific examples as positive or negative points. Asking for adjectives for certain points within the technical instructions will provide me with personalized feedback that expresses the test taker's sentiments as precisely as possible. I would also like to create an entry for suggesting improvements to my instructions.