The study examines the application of ASSURE model in lesson development and delivery among teachers in Rivers State, Nigeria. Descriptive survey design was adopted for the study. The population of the study is 12, 988 teachers of basic education, Krejcre Morgan sampling size table was used to arrive at 371 out of which only 365 teachers participated (175 male and 190 female) drawn from rural and urban schools (168 rural and 197 urban schools teachers) of the study area. Teachers’ Assessment on application of ASSURE Model (TAAM) questionnaire was developed by the researchers using the phases of ASSURE model. The questionnaires was given face validity by experts of Educational Technology and Measurement and Evaluation from Department of Educational Foundations, Rivers State University Port Harcourt. TAAM was tested among 20 teachers who were not involved in the study within Oyigbo metropolis, Rivers State and a reliability of 0.71 was obtained using Kuder-Richardson Formula (KR-21). The findings revealed that ASSURE model were applied in lesson development and delivery to a high extent. However, the findings also revealed the phases of the models where teachers were yet to apply to a high extent. Thus, it was recommended that adequate supervisions and sensitisation through workshop be given to enhance teachers’ capacity in the analysis of learners’ characteristics, selection of technology, media and stating of objectives appropriately and adequately.