Mentor placement at the IO 558 Sangkakala Medan Child Development Center sometimes finds it difficult to place and evaluate the results of the data directly. Sometimes there is a placement error that can make the results of the work given not optimal, this can hinder the performance of the mentor. Therefore, we need a decision support system that can make the mentor placement process easier. Decision Support Systems are computer-based systems capable of solving unstructured problems. Rank Order Centroid is used as a method for weighting the criteria. While the Composite Performance Index method is a method based on the combined performance index of various alternatives against non-uniform criteria.Keywords: Decision Support System, Placement, Mentor, CPI, ROC
                        
                        
                        
                        
                            
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