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The current study is a part of a three-year research aiming at developing student worksheets which are based on scientific project approach, which consists of inquiry, problem-based learning, and project-based learning models. This study is at dissemination phase, in which it attempts to investigate the effectiveness of the scientific project-based worksheets that were developed in the second year of the research. This study employed educational research and development (R & D). The instrument used to collect the data were scientific project-based worksheet, assessment sheets to assess the participants- cognitive, affective and psychomotor aspects, questionnaires for teachers, practitioners and students. The dissemination involves 29 students taking internship program from 2013 to 2014, at several schools in Bandung. The results show that scientific project-based worksheets, with N-gain average of between 0.55-0.82 is categorized as medium and high, and significantly different at significance level α = 0.05. It means the use of the worksheets significantly improves learners- concept understanding as a whole. Feedbacks gained also suggest that the developed worksheet models have positive effects on the students attitude towards science, with the average score from 81.33 to 88.37. The rate for psychomotor aspect, with its mean value 80.73-91.67 has proven to be effective to encourage students to be more active during lab activities.