This was a Research and Developmental study designed to develop and validate projects for Junior Secondary School Basic Science instruction and evaluation. The projects were developed using the project blueprint and sent for validation by experts in science education and measurement and evaluation; using a project validation scale. They were to rate the project task and skills in terms of their appropriateness and suitability. The projects were later administered on 1584 students. The result showed that the project measures of skills and task were significantly related. The project sub-scale of cognitive, affective and psychomotor was also significantly correlated. The inter-rater reliability index varied from 0.75 to 0.92. Hence, the projects were recommended for instructing and evaluating Junior Secondary School Basic Science.