Effect of Advance Organizers Teaching Approach on Student’s Achievement in Biology in Public County Secondary Schools in Kitui Central Sub- County, Kitui County Kenya

The purpose of the study therefore was to establish in biology in secondary school. The study adopted a Quasi Experimental research design and in particular the effect of the use of Advance Organizers on the students’ achievement Solomon’s Four Non Equivalent Control Group Research Design. The accessible population was 252 form three students in single county schools in Kitui central sub count participated in the study. Simple random sampling technique was used to select and to assign participating schools in experimental and control groups. Descriptive statistic and inferential statistics, ANOVA and t-test were used to analyse the data.. Results of this study reveals that the use of Advance Organizers significantly improvers achievements of students to learn biology. The researcher recommends extensive utilization of Advance Organizers be communicated to administrators, teachers and students teachers of all grades and disciplines through on going supportive professional development activities.