The aim of this study is to examine the influence of interpersonal communication, organizational commitment and supervision to principal's performance either individually or jointly. Variables of interpersonal communication, organizational commitment and supervision function as independent variables while the dependent variable is principal's performance. The research was conducted on proportional randomly selected 162 principals of public elementary school in Cianjur region, West Java, Indonesia. Using mix method, sequential explanatory design is applied where quantitative come first. The study both quantitatively and qualitatively reveals that there is a positive significant relationship among variables under the following distribution of coefficient of correlation: interpersonal communication to principal's performance = 0.552, organizational commitment to principal's performance = 0.468, supervision to principal's performance = 0.454 and when tested together it produces coefficient of determination = 0.424 indicating the existence of other 57.6 % variables not including in the model affecting principal's performance within the public elementary school principals' working environment.