Aftab Ahmed A study of chemistry students' and teachers' perceptions about effectiveness of chemistry laboratory work in development of science skills : M.Ed. Science Education Aftab Ahmed - Islamabad: AIOU, 2013. - xi, 78p. HB Eng Standard No.: https://i.ibb.co/DcNFC41/Thesis-cover.png Subjects--Topical Terms: Science educationDissertation, Academic -- M.Ed. Science Education Dewey Class. No.: 507 / AFS