the researcher used the checklist to assess the student's mastery level skill l while changing a skill and recorded his score on the learning curve based on a 1 (no mastery) to 100 (complete mastery) scoring scale. This procedure continued until the learning curve reached to a plateau state, i.e. either reaching to the full mastery score (100) or revealing no significant change in three subsequent sessions. All the students achieved mastery (the plateau state) after performing the task for at most ten times.

The checklist contained steps for performance skill rated on a 1 to 3 scoring scale (1= The researcher used the checklist to assess the student's mastery level while changing a skill and recorded his score on the learning curve based on a 0 (no mastery) to 100 (complete mastery) scoring scale.Required Standard frequency for skills performance based on learning curve plateau, achievement of 75% of expertise and, 75 percent of students who achieved 75% of expertise in the following skills.