This paper presents an approach for generating Unified Modeling Language (UML) class diagram. The objective of the project is to assist users in generating class diagram in a systematic way, with less dependent to the developers' skill. The approach consists of a number of steps or instructions to be executed by users. Executing the steps requires the user to enter inputs that will then generate half-completed class diagram. Step-by-step approaches are presented to show how the candidate of classes, attributes and relationships between classes are captured. The proposed approach is presented using a case study of ATM system. Testing was conducted to assess the effectiveness of the proposed approach. Analysis and discussion of the testing results are discussed in a few last sections of this paper. The development of the system is underway.