Qualitative and microcosm models were used to predict effects of herbicide application for control of Myriophyllum spicatum. Predictions were compared to data from Pat Mayse Lake, a Texas reservoir, where localized areas were treated with endothall. Although milf oil was temporarily eliminated, when endothall was used according to manufacturer's directions, no ecologically significant direct or indirect effects were observed on nontarget species or abiotic water quality. Comparisons of the predictions with field data confirmed the capabilities of this approach for estimating risk and emphasizing the importance of identifying regulating or driving factors that modify environmental impacts of aquatic weed control programs so they can be incorporated into future risk assessments.

This thesis records data on the development of The Park Boulevard Players, Plano, Texas, as an innovative school district theatre arts program. Data is organized to illustrate program growth based on educational and performance needs of involved students and community citizens. It proves that high school students are capable of producing summer entertainment worthy of community viewing. Being original in form and content, this thesis should serve as a resourceful guide for similar programs. The thesis contains five chapters arranged in chronological order. After Chapter I, Introduction, three chapters span three separate company seasons: June, 1978; June, 1979; June, 1981. The final chapter summarizes the program and presents evaluations and conclusions.

In an attempt to find meaningful predictors of the ability to interpret Rorschach protocols by clinicians, a paradigm change (Kuhn, 1962) was instigated by using as predictors the scores of the perceptual organizational abilities of 30 subjects, and their ratings of favorableness toward the Rorschach in terms of its usefulness as a clinical tool. The subjects were first year, graduate psychology students, and the Haptic Visual Discrimination Test (HVDT) was the instrument used to measure perceptual organization. A multiple linear regression analysis was computed, and the data supported the hypothesis that perceptual organization and favorableness are of significant predictive value (R = .54, F(2, 27) = 5.43, p = .01). The standardized beta for usefulness was .47 (p = .008) and the HVDT beta was .33, (p = .05). The results were interpreted as applying to Rorschach validity research methodology and pedagogy.

The purpose of this study was to examine the effects of fatigue on force application and resulting movement patterns during the performance of consecutive chin-ups. Special attention was directed toward relating any fatigue effects to upper limb strength dominance. Twenty male adult subjects each performed one trial. Each trial consisted of consecutive chin-ups. Fatigue caused changes in the movement patterns, duration of movement and force applied through the supporting hands. Throughout the performance greater vertical forces were applied through the dominant upper limb segment with the application of these forces resulting in horizontal displacement of the total body center of gravity toward the dominant hand.

This study investigated the effect of cost-of-escape on helping among children. Forty-four children between the approximate ages of six and twelve served as subjects. The experiment was performed in a natural setting using an ice cream truck. The driver (experimenter) manipulated the cost-of-escape and then had an "accident." The easy-to-escape group received their ice cream before the driver spilled 300 spoons on the ground. The difficult-to-escape group had paid for their ice cream but had not received it before the "accident" occurred. The number of spoons picked up by each condition and the lapse time before a member of each group began to help was recorded. No differences were found between the groups (all ps > .05). Implications for cost-of-escape were discussed.