不幸的是，由于不同的项目使用不同的bug跟踪系统，版本控制系统，审核系统，使得贡献和提交代码变的不是那么容易。
Unfortunately it's not always easy to contribute because different projects will use different bug trackers, version control systems, and approval processes.
准确的估计是进行有效的项目计划、跟踪和控制的基础。
Accurate estimation is the foundation of effective project planning, tracking and controlling.
跟踪和控制项目关键点，如原材料采购，质量检验(过程检验、终检)。
Follow up each key point, such as raw material purchasing, quality control (mid-inspection, end-inspection).
跟踪和控制项目关键点，如原材料采购，质量检验(过程检验、终检)。
Follow up each key point, such as raw material purchasing, quality control (mid-inspection, end-inspection).
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