The development of information systems in currently preserve to adjustment and it was customized according to the problem domain. In this paper, we will describe the modeling language that is applied when developing an information system. The development of information systems has become a trend for the last decade. Various methods have been proposed with different characteristics. The counseling information system in this case was developed with an object-oriented approach. The strong motivation in this research is to answer the challenges and demands of system development. Modeling in system development explains various modeling languages starting with identifying problems with use case modeling languages (Use case Diagrams), simplifying problems with structured modeling (Class Diagrams), to building communication patterns or interactions between objects with one another (Sequence Diagram). Thus, the system built is able to describe the complexity of information systems, especially counseling information.