10.22376/ijpbs.2019.10.1.p1-12 Volume 7 Issue 3 2016 (July - September) Computer assisted education services are recently developing trend in giving health education , and useful in raising standard of community health, Mothers are considered as a best setting for the positive health and prevention of diseases in children, awakening health consciousness in which the child grows and develops. The main objective of the study is to assess the posttest knowledge on selected water borne diseases and its prevention and to evaluate the effectiveness of Computer assisted teaching regarding knowledge of Water borne disease and its prevention. A quasi experimental design with simple random sampling technique, 100 samples was analyzed by descriptive and inferential statistics. The Results shows that the overall mean score of pre-test was 7.38 with the SD 2.15, whereas in post-test it was 11.84 with the SD 1.57. The t-test value was 23.16 which is statistically significant at P=0.001.After Computer Assisted Planned Teaching mothers are gained 31.9% of the knowledge than pretest. S.VIMALA Water borne disease, computer teaching, underfive mothers, prevention 554-556