Reliability estimation framework for object oriented design has been developed in this paper. The proposed framework relates the object oriented design constructs (Inheritance, Cohesion and Coupling) with design defect and the design defect correlates with the reliability of the object oriented design (OOD). The objective of framework is to implement relation between object oriented design constructs and design defect; object oriented design defect and reliability. Framework, quantify the

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... of object oriented design constructs and mitigate the defect of software design. Two models have been proposed: Reliability estimation model and rigidity estimation model. Rigidity estimation model has been proposed which focus on object oriented design constructs while reliability estimation model focus on rigidity defect mitigation for improving reliability of object oriented design.