In object oriented standard the analysis and design events are performed to produce models like analysis model, use case model and design model. These models are developed using Unified Modeling Language abbreviated as UML. Visual modeling using UML is the part of unified software development process. The wholeness or fullness of documenting requirement engineering models like use case model, result in a better quality software product. If we miss anything or commit any mistake in use case model it may transmit to analysis phase. Further there are chances that the same bug is propagated to design, testing and so on until deployment. The cost of eradicating bugs in testing is very pricier than that of its removal in the starting phase or model. It is therefore very necessary to verify what model we are developing and after the model making process is verified it is necessary to validate the model; that is to declare that the model we have made is correct. In this paper we have investigated the verification of the process of modeling in object oriented paradigm and the validation of the models. This workout makes certain that we are working on the precise models to yield correct product from quality point of view. We have prepared the software metrics based on FI/LI/PI/NI approach of CMMI to evaluate the UML models.