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50 weeks 80 cents Ability Scores ability test battery amount of practice arranged average number average scores compared comparison control and trained control group converted into sigma determine Diff difference Drawing and Electricity Drawing and Sheet effects of practice Experimental Study factors in common five courses followed by Sheet followed by Woodwork grade in Woodwork higher average grade investigation less factors lower average grade mazes measurements mechanical ability averages mechanical ability test Mechanical Drawing followed negative practice effects number of common number of factors number of similar Oloth OOIOOS pair of courses positive practice effect practice course practice-test course combinations procedure project scores quality of performance Rank Order Total secured Sheet Metal followed showed positive practice Similar Materials Similar Operations Similar Tools sub-groups test course third course TP TP trained group obtained training period transfer of training tricity Volume wire Woodwork and Printing Woodwork followed WWWW