Citation note: Using overhead projector and pre-prepared transparencies, chemistry to senior students was taught by two physics teachers in the absence of chemistry teacher. The transparencies worked as lesson plans and at times the blank transparencies replaced the chalkboard. The main advantage was that the teachers could face the students all the time and talk to them with eye-to-eye contact. Students reacted positively to the use of overhead projector for classroom instruction and even helped the teachers in producing revision transparencies.