Abstract: Research purposes to determine the effect of learning activities, assessment techniques and the influence of interaction on learning achievement Basic Physics II,. The method used is an experimental method with a 2 x 2 factorial design. Implementation of learning activities and assessment techniques as the treatment variable, the results of learning Basic Physics II as the response variable. The sample in this study were students of Physics Department of class A and class B are determined by the number of respondents multistage sampling 76 students. Analytical techniques used to examine the effect ANCOVA main factors (main effect) and the influence of the interaction factor (interaction effect).The study concluded that implementation of lesson study and performance assessment techniques more effectively improve learning achievement Basic Physics II compared with conventional learning techniques with a written assessment test. Suggested in the courseBasic Physics II and using lesson study as a form of performance assessment activities in the lecture course are seeded in the first year Physics with Mathematics and Science.