To address the problem of increasing professional isolation of building administrators, the Principals' Inservice Project helps establish principals' collegial support groups across the nation. The groups are typically composed of 6 to 10 principals who meet at least once each month over a 2-year period. One collegial support group of seven principals underwent onsite analysis to determine the extent of the collaborative arrangement. The review of the group included individual interviews with each principal and the facilitator and observations of group meetings. All principals indicated that the collegial support group allowed members to share common problems with other administrators and to use suggestions from the group to generate possible solutions. Newer principals viewed the group as a learning experience; experienced principals saw the collegial arrangement as a way to keep them focused on their present roles. The principals were unanimous in stating that they wanted structure in group meetings, though the facilitator felt that the group relied on him too much. The third issue explored dealt with the demonstrable results in the schools of principals participating in the project. All the principals agreed that their involvement with the project had already paid some dividends to their schools and district. (MLF)