This brief paper describes a Macintosh computer program designed specifically to support the collaborative work of special education resource teachers. The increasing importance of collaboration between special and regular educators in serving the needs of students with disabilities is noted, as is the potential role of the microcomputer in aiding collaboration. The AIMS (Assessment and Instructional Management Support) CoPlanner has the following features: (1) worksheet and summary components to support collaborative planning; (2) an online mail system to facilitate communication; (3) online tools to support assessment and teaching tasks; (4) report planning and reporting features; (5) a thesaurus to help collaborating educators achieve consensus on the use of language in collaborative reports; and (6) situational "balloon helps" and an online manual for effective use of the system. A separate section containing the highlights of the AIMS CoPlanner is attached. (DB)