The aim of this study was to examine how Microsoft PowerPoint is used by science teachers in Trinidad and Tobago and to gauge from teachers what considerations influence their decision to use PowerPoint presentations in their science teaching. A total of 20 secondary school science teachers were observed using PowerPoint in the delivery of science lessons. The findings indicate that science teachers used PowerPoint slides largely as glorified lectures to present information to students. Some teachers used PowerPoint to introduce their lessons and some to summarise lessons.