PBD方法是BBD方法的成熟和扩展，它延伸了设计重用的理念，强调系统重用。

PBD is BBD's matureness and extendability, it extends design reuse idea and emphasizes system reuse.

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模型在实现上采用先进的组件技术，使教学资源规范化、标准化，使系统重用性好、可扩展性高。

CBGICAI model USES advanced component technology in the realization, make teaching resources standardized, make the system has a good reusability and a high expansibility.

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提倡系统级重用失败的原因各种各样，其中包括技术和组织方面的原因。

There are a variety of reasons systematic reuse initiatives fail including technical and organizational reasons.

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