The need for specific information about principals as change facilitators prompted a long-range research program. A first step in this effort investigates the interventions principals make in relation to the implementation of an innovation in their schools. Subjects were 10 principals of elementary schools where an identifiable innovation operated. The number of interventions the principals reported during the study are analyzed according to the function of the intervention. The kind of planning the principals did relative to implementation of the innovation is also reported, along with a comparison of the type of planning they did with the number and kinds of interventions they made. Following the analysis of functions, comparisons were made among and between principals concerning the kind and number of functions they performed, the kind and number of functions based on number of years into the implementation effort, and the relationship between functions and the principal's planning. (MLF)