CONCLUSION: the 4 kinds of individual changing trends in pretest-posttest design show the problem of the individual change can't be ignored when we analyze the data of pretest-posttest design.
结论：总结了前后测量设计资料个体生长趋势的4种情况，提示我们在分析前后测量设计资料时个体自然生长问题不容忽视。
Then, it points out the whole procedure and the design of questions in the pretest and posttest.
随后详细描述了整个实验过程及前后测实验题目的设计。
Then, it points out the whole procedure and the design of questions in the pretest and posttest.
随后详细描述了整个实验过程及前后测实验题目的设计。
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