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The correct formal design is an achievement in software engineering, but we faced with challenges to satisfy that. The informal problems types are general or special. The special informal problems depend on the case study and the general informal problems come from an inexperienced designer called anti-patterns". In this paper we discuss these two types on Insulin Infusion Pump (IIP) and sample of UML class diagrams. The proposed approach to formalize IIP is based on using event B. Finally, wedoi:10.21608/ijicis.2017.9149 fatcat:gcustkk4afhbvlrulfdt7egm7i