You have several dimensions here.
First you have the posibililty of variability among the supervisors. With
only 20, you may as well give them all the test because by chance you
could leave out those supervisors who will cause you trouble later on.
Next, and more difficult is the variation in knowledge. What are the most
important aspects for the audit? Is conceptual knowledge more important
than ability to express themselves before their subordinates? What about
their level of committment to the program? Is lip-service good enough?
Is a paper-and-pencil test the most appropriate? What about on-the-spot
inconspicuous observation of each work group for a period of time? Perhaps
the expert judgement of someone in the management chain is as valid as any
test?
If you take the task too seriously, you will run out of time. Perhaps
questions based on the instructional materials used are sufficient.
Perhaps not.
[EMAIL PROTECTED] wrote:
> We are going to do a quality system audit (like ISO 9000). How do I
> choose the sample size for a particular group of people? Let's say
> that there are 20 supervisors and I will audit their knowledge of SPC,
> how many should I choose for the audit?
>
> Sent via Deja.com http://www.deja.com/
> Before you buy.
