I have many criteria to evaluation the usability of web-based learning application, I would like to apply this criteria on the learning web-site, how can do this, individually firstly , or test it into group ,,, or tow method may occur?
You can apply "heuristic assessment" yourself, and it would be way better, if you can engage a few exeprts more for heuristic assessment. Then, you can use Computer System Usability Quesitionnaire (CSUQ), or a similar tool to measure subjective usability of the website. Finally, you can apply user tests. I recommend starting with heuristic assessment.