This study aims to produce a quality handout judgment subject teachersOccupational Health and Safety (K3) SMK.This research is the development of a model of development based Thiagarajancalled 4-D which consists of four stages, namely: (1) Define, (2) Design, (3)Development, (4) Disseminate. This handout is then assessed by the K-3 teachers 3PeopleJob SMK. The research instrument used was a validation sheet handout.Based on the results of the validation, developed handouts categorized as veryfeasible to use the results of the overall average of 86.5%. The results validate the contentaspect handout 89%, 75% aspects of format, language aspects of 87.5%, 83.75%illustrative aspects and manners 95%. These results indicate that the handouts weredeveloped in the category is eligible to be used on subjects in the Occupational Safety andHealth Tamansiswa SMK Surabaya.