Consultation is an integral part of many Educational Psychologist’s (EPs) work. Yet there is a large heterogeneity in understanding and use of this tool. Such diversity makes evaluating its efficacy difficult. This research therefore sought to identify what the effective features of consultation are by linking observed features to changes in agreed outcomes for children and young people (CYP). Mixed methods were employed to explore what EPs believe are the key features of consultation, what the barriers to effective consultation are, what happens in a consultation for a child or young person, and what combination of features can be identified in consultations which lead to positive changes for CYP. To explore EP views towards the effective features of consultation, 30 EPs were interviewed. Observable features of consultation were tallied for six consultations. For those consultations, goals were identified by participants and a baseline rating was given for each goal using Target Monitoring Evaluation (TME) forms. There were 10 goals identified. Change for these goals was recorded through completing the same form 6-8 weeks later, to allow analysis of which combination of features were present for children with differing progress towards outcomes. This was assessed using Qualitative Comparative Analysis (QCA). The most effective features of consultation, as identified by EPs, included the expert knowledge EPs have, the collaborative nature of consultation, and creating a shared understanding of the CYP and context for all participants. Consultations which were most likely to see positive change for CYP were ones in which the consultation was not dominated by gaining an understanding of the presenting problem. These results give clarity as to what the features of an effective consultation are through a mixed methods analysis. The findings have implications for EPs who use consultation, as well as consultees and those whom consultations are for.