Test?

[bob jenkins]

It's necessary, but not sufficient.

IOW, someone who scores well may or may not be a good official.

Someone who doesn't score well (in general) would not be a good official.

If I have a choice between working with two partners, and all I know about them is that one scored 100 on the test and one scored 75, then I'll choose to work with the one that scored 100. If the two scores are 96 and 95, then it doesn't make any difference.

And, of course, it depends somewhat on how the test is administered.