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Abstract: ? Software systems ? are becoming more and more complex. ? used in safety and security critical applications. ? Formal methods are one way to ensure the correctness. ? But, formal methods are hardly used by industry. ? difficult to understand notation ? lack of tool support ? high costs ? Semi-formal methods, especially uml, are ? widely used in industry, but ? not strong enough for a formal methodologies. Achim D. Brucker Verification of uml/ocl Specifications with hol-ocl Motivation Turning uml/ocl Into a Strong Formal Method Developing Formal Tools Using Embeddings hol-ocl Conclusions Bi Is ocl an Answer? ? uml/ocl attracts the practitioners: