-51 TABLE III F AND T RATIOS OF FIVE DESIGN SUBGROUPS ON NATURE OF SITUATION SCORE OF OBSERVATION INSTRUMENT Nature of Situation Subgroups F Ratio d.f. 02<01 3.0704 11 0 <0 14.9078 ** 12 5 4 02<04 3.0270 12 05<01 20.2428 **11 T Ratio d.f. 02<03 2.886 12 * confidence level 0.05 ** confidence level 0.01 Three subgroups discriminated significantly between the control and experimental groups on the variable, nature of the situation. Two subgroups did not discriminate significantly on this variable. This variable showed the highest discrimination of the five subtopics of the observation instrument.