“A Study To Assess The Effectiveness Of Planned Teaching Programme On Early Signs And Prevention Of Myocardial Infarction Among Industrial Workers In Selected Area Of Sangli, Miraj And Kupwad Corporation. this study is done with the objectives, To assess pre-test knowledge score related to early signs and preventions of myocardial infarction, To assess post-test knowledge score,& To compare pre-test and post-test knowledge score .material and Methods: A quasi experimental one group pre-test and post-test design used ,sample selected by using simple random sampling technique, 60 samples were selected of age group 21 to 60 years . A self- structured questionnaire was used to assess the level of knowledge among industrial workers. Result: Pre-test level of knowledge shows that 50 (83.3%) workers have adequate knowledge, 3 (5%) have poor knowledge and 7(11.6) % of workers having good knowledge . In post- test, 39 (65%) workers has good knowledge, 11(18.3) % have very good knowledge and 10(16.6%) have adequate knowledge. The overall pre-test mean score was 8.6 and S.D. was 1.439and post-test Mean score was 12.136and S.D. was 1.548. It shows that highly significant difference is found between pre-test and post-test mean score of knowledge. P- value is 0.00 which is less than 0.05. Conclusion: Planned teaching program is effective regarding early signs and prevention of Myocardial infarction. Statistically it was found that there is highly significant difference in pre-test and post-test scores. So, hypothesis H1 was accepted.