从测试参与者的表现收集定量数据。
更重要的是，相比定量研究，数据的收集过程对定性研究的结果有更重大的影响。
More importantly, the data collection process in qualitative research has a far greater impact on the results as compared to quantitative research.
自1990年代起，科学家和区域性管理机构就已经开始了数据收集工作，通过对“食物链等级”上不同种群间的生态平衡变化进行定量研究。
Since the late 1990s, scientists and regional management organisations have used catch data to measure changes in the balance of species across so-called "trophic levels."
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