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This study examined the effectiveness of computer–assisted and excursion strategies on secondary school students’ achievement in Biology towards sustainable development. The study adopted quazi experimental research design. The population consisted of all the biology students in public senior secondary schools in South West, Nigeria. The sample for the study consisted of 240 senior secondary year two (SS2) Biology students selected from six schools in the three states from South West Nigeria using multistage sampling technique. The subjects were divided into the two treatments and control groups, that is, Computer Assisted, Excursion and control groups. A forty item multiple choice test on Biology was administered to the students after exposing the experimental groups. The treatment is teaching. Three hypotheses were formulated and tested; the data generated were analyzed using t-test and Analysis of Covariance (ANCOVA). The result showed that the achievement of students in the two experimental groups were better than those in the control group. Students taught with excursion strategy achieved better than those taught with Computer Assisted strategy. Also, location has significant effect on achievement while gender has no significant effect on achievement in Biology. Based on the discoveries, it was recommended that Excursion strategies and Computer – Assisted should be employed in the teaching of Biology as innovative strategies.	 	Key words: Science students, teaching strategy, research, sustainable development.

Effectiveness of computer-assisted and excursion strategies on senior secondary school students achievement in Biology towards sustainable development