DOCUMENT RESUME JC 700 176 Giles, Louise A Research Project to Determine the Student Acceptability and Learning Effectiveness of Microform Collections in Community Colleges: Phase Final Report. American Association of Junior Colleges, Washington, D. C,. Office of Education (DHEW) , Washington, D.C. Bureau of Research. BR-9-0260 Jun 70 OEC-0-9-180260-3703-(095) 248p. EDRS Price MF-$1.00 HC-$12.50 *Educational Research, Educational Resources, *Educational Technology, Information Retrieval, Information Storage, *Instructional Materials, *Junior Colleges, Microfiche, Microfilm, *Microforms Microform collections offer one of the more promising methods of increasing student learning while, at the same time, responding economically to the pressure of increasing enrollments. This study reports on the first phase of a 3-phase project to determine student acceptance of microform, and on the effectiveness of microform for learning. Included in this report are a description of the problem to be investigated, the methods and activities involved in establishing the project office and selecting staff, and the progress of the project to date. At this time, microform materials will be used in conjunction with the following courses: art appreciation, Black studies, college algebra, economics, freshman composition, life science, nursing, political science, basic psychology, and beginning college Spanish. Bibliographies for these courses have been prepared (included as appendices to the report) and will be microformed to provide most of the necessary course material. In concluding the Phase I report, the principal investigator observes that completion of the full study could have a meaningful effect on patterns of information storage and retrieval, and on the field of educational resources in general. -(Phase II will involve the conduct of a pilot study using developed materials, and Phase III will involve the conduct of a full field study and evaluation of the results.) (JO) U.S. DEPARTMENT OF HEWN, EDUCATION & WELFARE OFFICE OF EDUCATION THIS DOCUMENT HAS BEEN REPRODUCED EXACTLY AS RECEIVED FROM THE N. PERSON OR ORGANIZATION ORIGINATING IT. POINTS OF VIEW OR OPINIONS STATED DO NOT NECESSARILY REPRESENT OFFICIAL OFFICE OF EDUCATION POSITION OR POLICY. C:) L4.1 Final Report Contract No. OEC-0-9-i80260-3703-(095) A Research Project to Determine the Student Acceptability and Learning Effectiveness of Microform Collections in Community Colleges: Phase I

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A Research Project to Determine the Student Acceptability and Learning Effectiveness of Microform Collections in Community Colleges: Phase I, Final Report.

A sensitivity analysis is a powerful technique for understanding systems. This heuristic paper shows how to overcome some of the difficulties of performing sensitivity analyses. It draws examples from a broad range of fields: bioengineering, process control, decision making and system design. In particular, it examines sensitivity analyses of tradeoff studies. This paper generalizes the important points that can be extracted from the literature covering diverse fields and long time spans. Sensitivity analyses are particularly helpful for modeling systems with uncertainty.

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Sensitivity Analysis, a Powerful System Validation Technique

En biologie, le choix de l'organisme etudie et les techniques utilisees ont un impact serieux sur l'evaluation et sur l'evolution des travaux de recherche. Quelle est l'importance de l'echec d'un tel choix?

How the choice of experimental organism matters: epistemological reflections on an aspect of biological practice.

We explore the evolution of dominance at polymorphisms maintained either by overdominant selection or by migration-selection balance. At such balanced polymorphisms, heterozygotes remain at appreciable frequencies over long periods of time, allowing extensive modification of dominance to occur. The strength of selection favoring a modifier of dominance is roughly proportional to the probability that a modifier allele is found in a heterozygote at the locus subject to balancing selection times the heterozygote fitness increase caused by the modifier. Using a two-locus model, we elucidate the interesting ways in which recombination and migration cause departures from this rough expectation. For example, with overdominance, a genetic association with the rarest allele favors a modifier that increases heterozygote fitness because the modifier occurs more often in heterozygotes. With migration-selection balance, dominance evolves more readily in patches experiencing the strongest selection. We also find that, while there are more heterozygotes in sink populations (which have higher rates of immigration than emigration), selection for dominance in sink and source populations is nearly equal because sink populations make a lower genetic contribution to future generations. We conclude that the evolution of dominance is likely to occur whenever polymorphism is maintained by either overdominance or migration.

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C. P. Oliver

Papers

The origin of genetics, a mendel source book