This special issue was developed to address the knowledge gap in educational and psychological consultation. The opening article sets the stage by offering answers to the question, "What is 'collaboration'?" The second paper carefully examines the problem-solving and social influence tasks within a previous integrated model of school consultation. In a process-outcome study of conjoint behavorial consultation, the next paper employs a relational communication framework and finds that parental influence is associated with less favorable outcomes in CBC. Finally, the last two articles use case study methodologies and qualitative data analysis techniques to examine consultation within school-based problem-solving groups, such as student assistance and study teams.