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Formal Method (FM) is an emergent feature that uses mathematical notations to mark accurate and explicit specifications that error and discrepancies are identified during early phases of the software development process. By using the Z specification, system specification, design and verification can improve the quality effectively. In this paper, we present the formal specification for the e-Health system by using Z schema. This paper will be motivation to Formal Methods that FM not only beneficial for mission critical systems but also in the commercial and business oriented applications, because the development time, verification and maintenance cost will drastically reduce.

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