为持续追踪的问题建立研究工具，关键上下文不再散落。
把每一次资料处理放进可回看的过程，才能知道结论从哪里来。
材料有来处，也有回看的位置。
比较、摘录与结论留在同一个上下文里。
把研究带到下一项需要完成的工作。
可检查的研究过程
从一个真实任务开始，让方法逐步成形。
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