<![CDATA[The purpose of the research is to increase students affective ability of class VII A SMP Negeri 16 Surakarta through the implementation of Cooperative Learning by Group Investigation method on Environmental pollution material. This research is a Classroom Action Research with two cycles of action. Each cycle consisting of four phases which is planning, acting, observing, and reflecting. Observational data obtained from the questionaire, observation, and interview. Subjects were students of class VII A SMP Negeri 16 Surakarta. Data validation is use triangulation methods. Technical analysis of data is technical descriptive. The result of this research showed that averagely assesses percentage each indicator of students affective responses questionnaire on pre cycle is 66,39 %, first cycle is 76,95 % and second cycle is 84,01 % (worked up 7,06 %). Meanwhile on a percentage point each indicator which is gotten from observation result students affective responses for pre cycle is 48,52%, first cycle is 72,22 % and second cycle is 82,35 % (worked up 10,13% ). The students interview result are 97,22% students interested in implementation on Group Investigation method, 80,56% students asking question, 83,33% students respond the idea from another student, and 83,33% students find out a problem solving. The result showed that Cooperative Learning by Group Investigation could increase students affective ability of class VII A SMP Negeri 16 Surakarta class year 2010/2011 in Biological learning. Key Words: Cooperative learning, Group Investigation, Students Affective Ability ]]>
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