The purpose of this study was to examme the effects of PerceivedrnOrganizational Support, Participation m Decision-making, Extra RolernInvolvement, Teaching Experience, and Feelings of Professional Community onrnProfessional Commitment of teachers' teaching in West Gojjam Zone highrnschools. In developing the instruments, Cronbach's alpha reliability for eachrnscale and item total correlations for each items were computed for pilot andrnalpha coefficient again for the main study. 135 randomly selected teachers andrn7 principals of each from 7 randomly selected schools of the Zone were used asrnthe sample of the study. The data were gathered with 59 close-ended items andrnwith some open-ended questions for teachers and with semi structuredrninterview for school principals. Pearson product moment correlation, analysis ofrnvariance (ANOVA), multiple and stepwise regression analysis were used tornanalyze the data. The result revealed that professional commitment wasrnpositively and significantly correlated with participation in decision-makingrn(r=.625, p