提出了一种从数据精化、过程精化、再数据精化的两次数据精化的形式化软件开发方法。

A formal software development method of using data refinement with two times is introduced, which from data refinement to process refinement then to data refinement.

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目前软件开发中的形式化方法主要是形式化规范说明语言，有Z语言、VDM语言和RAISE语言等。

Nowadays, theformalized methods in software development mainly are formalized specification languages, such as Z language, VDM language and RAISE language, etc.

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方法是一种软件形式化方法，支持从规格说明到代码生成的整个软件开发周期。

B-method is a software formal method, which supports the whole lifecycle of software development from formal specification to code generation.

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