The study is entitled Assessment of principals? role performances in the management of secondary schools in Kaduna metropolis, Kaduna state, Nigeria. Seven objectives were formulated among which are to determine the principals? decision making process in secondary schools and to ascertain the pricipals communication role performance in secondary schools in Kaduna metropolis. Seven research questions were asked in line with the objectives and seven null hypotheses were postulated and tested at P≤ 0.05 level of significance some of which states that there is no significant difference in the opinions of the respondents on staff development, maintenance of discipline and community relationship in secondary schools in kaduna Metropolis, Kaduna State. The study adopted the survey research design; the population of the study covered all the principals, teachers, non-teaching staff and Supervisors in the metropolis from which 21 principals, 253 teachers, 63 non-academic staff and 10 supervisors were randomly selected as sample for the study. The instrument used was an adopted questionnaire which was validated and has a reliability value of 0.86. The research questions were answered by means of the descriptive statistics (simple percentages, mean and standard deviation scores) while the hypotheses were analyzed using the Analysis of Variance (ANOVA) at P≤ 0.05 level of significance. From the analysis, two hypotheses were retained while five hypotheses were rejected. The findings of the study revealed that there is a significant difference in the opinions of respondents on interpersonal relationship role performance of principals in secondary schools in Kaduna metropolis and also, a significant difference exists in the opinions of respondents on the principals? decision making process in Kaduna metropolis. However, among the retained hypotheses, one is on the principals communication role performance in the management of secondary schools in which there is no significant difference in the respondents? opinions. The study demonstrates that the work of principals entails the application of conceptual, technical and human relations skills. It shows how these skills are interwoven in both school administration and leadership. In view of these findings, recommendations were made some of which are that principals should always ensure strong interpersonal relationship in secondary schools in Kaduna metropolis, there should be more teachers? participation in decision making process in secondary schools in Kaduna metropolis and also principals should improve in their communication strategies with both teachers and students in an attempt to have effective management of secondary schools in Kaduna State