Page:Kohs-Block-Design tests-1920.pdf/10

 To clarify the table, one or two illustrations will be utilized. For example, design number two has a score value of 5. This full amount is attained if a reagent completes the design successfully in less than 31 seconds and with less than 7 moves. If 31 or more seconds are utilized, one point is deducted from the score, and if 7 or more moves are made an additional point is deducted. Take again design number thirteen which has a score value of 9. This full amount is attained if the subject completes the design successfully in less than 2 minutes and 21 seconds, and with less than 31 moves. If completed between 2 minutes 21 seconds and 2 minutes 33 seconds, one point is deducted, if 2 minutes 34 seconds or more are spent on the problem, two points are deducted. And if 31 or more moves are made an additional point is deducted from the score value of the design.

The scoring of a performance is a very simple matter. This will be self-evident from the following examples:

Example one: Design number 7 successfully completed in 1 minute and 23 seconds and at the end of 9 moves. Score 7, for successful completion, less 2 points for excess time. Final score 5. Example two: Design number 10 successfully completed in 1 minute 48 seconds, and after 19 moves. Score 9, for successful completion. No deductions for excess time or excess moves. Final score, 9. Example three: Design number 16, successfully completed in 3 minutes 27 seconds, and after 48 moves. Score 10, for successful completion. Deduct 2 points for excess time, and one point for excess moves. Final score 7.

It may be worth remarking that successful performance, speed and what may be termed accuracy are all combined in the final score. Successful performance receives greatest weight, speed next and accuracy next. The weight ratio as explained elsewhere in the monograph is roughly 4 : 2 : 1. This ratio has been empirically determined and was not derived by arm-chair philosophizing. The prevalent opinion, which was at one time shared by the writer, that speed and accuracy cannot be combined in one score, does not hold with the Block Design Tests. The writer felt that success, speed