The EJB specification is mature, yielding the benefit of well-known design patterns, case studies, and best practices, as well as a rich set of vendor-supported development tools.

EJB规范比较成熟，因而有许多优势：众所周知的设计模式、案例研究和最佳实践，还有丰富的供应商支持的开发工具集。

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Studies reveal the most costly aspects of software development and maintenance: change analysis, design, and testing.

研究表明，以下方面是软件开发和维护中开销最大的方面：变更分析、设计和测试。

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All of this leaves JDO developers and architects with few proven design patterns or case studies to guide their JDO development efforts.

所有这些现状使JDO开发人员和架构设计师几乎没有已经实践证明的设计模式或案例研究来指导他们的JDO开发工作。

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While completing my undergraduate studies at the University of Western Ontario, I put my web design and development skills to work for the university, becoming a part-time instructional technology consultant and managing the online web presence of countless courses.

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