Formal methods are being applied to the development of software of various applications at Philips Healthcare. In particular, the Analytical Software Design (ASD) method is being used as a formal technology for developing defect-free control software of highly sophisticated X-ray equipments. In this paper we analyze the effects of applying ASD to the development of various control software units developed for the X-ray machines. We compare the quality of these units with other units developed in traditional development methods. The results indicate that applying ASD as a formal technology for developing control software could result in fewer defects.
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