Estimating how much children work: Questionnaires versus time use diaries
利用中国和印度等九个中低收入国家的数据，发现时间日记法报告的儿童劳动时间远多于标准问卷，尤其在低龄儿童中差距更大，表明现有估计可能严重低估童工现象。
Current estimates of child labour often rely on questions such as, “How many hours did you work last week?” While biases in adult self-reports are well documented in high-income countries, there is limited evidence on the accuracy of children’s responses in low- and middle-income countries (LMICs). Using data from nine LMICs, including China and India, this paper shows that time diaries report considerably more work hours than standard questionnaires. The gap is particularly large among younger children, with ratios of diary to questionnaire estimates exceeding five at ages 5–11 and remaining above two even among adolescents aged 15–17. This suggests that current estimates may substantially understate child labour. Moreover, certain forms of work—such as collecting water or firewood—appear to contribute to these measurement gaps.