4 - you are comfortable with the subject area and all routine work on it.
For software areas - ability to develop medium programs using all basic language features w/o book,awareness of more esoteric features(with book).
For systems areas - understanding of many fundamentals of networking and systems administration,ability to run a small network of systems including recovery,debugging and nontrivial troubleshooting that relies on the knowledge of internals.
4分 - 你对主题领域和它的所有日常工作都很熟悉。
对于软件领域，能够使用书上的所有基本语言特性开发谋介程序，了解更深奥的特性（通过书本）。
对于系统领域——了解网络和系统管理的许多基础知识，能运行一个小的系统网络，包括恢复、调试和非琐碎的故障排除，这些都依赖于内部知识。
5 - an even lower degree of reliance on reference materials.Deeper skills in a field or specific technology in the subject area.
对参考资料的依赖程度更低。在某一个领域或某一个特定领域有较深的技能。
