This study investigated the instructional assessment practices, techniques, and challenges of science teachers in Barbados with a view to providing baseline data on the state of the art of this important aspect of science teaching. A total of 55 science teachers drawn from 12 out of 22 secondary schools in Barbados constituted the participants in the study. The self report data obtained by a survey questionnaire revealed that teachers use similar instructional assessment practices regardless of sex, teaching experience, professional qualification, or academic qualification.