A beta tester should double check the readme to be sure it EXACTLY complies to RR rules.

Check a zip to be sure ALL files are included.

Be able to open and check poser specific files (pp2, pz3 ect...) if all links are accurate AND that they are in the correct format ( colon vs backslash)

Load the product and check seams under a very bright universal light.

Make sure the readme useage instructions make sence.

and on and on ...

Then write a report back as a list of checks and problems found.

Basicly be able to do everything the merchant did to create and set it up.

I allways figure I'll need 6 testers to get 3 reports back.