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One of the means to enhance software reliability and quality is testing. The testing for object-oriented software is more complex and difficult than that for traditional programming. For object-oriented class-level and cluster-level testing, we proposed a significant methodology TACLLE which has been published in ACM Transactions on Software Engineering and Methodology (vol.7., no.3, p.250-95, 1998; vol.10, no.1, p.56-109, 2001). This methodology includes an important algorithm named DOE to determine whether two objects are observational equivalent or not. This paper presents the design and implementation for a new prototype of DOE using object-oriented paradigm. The new prototype is based on UML model. It is improved on the technique, and optimized in the system interface.