Max's study compared the differences in teachers' attitudes about inclusion before and after a Saturday in-service training. He assessed their post-intervention attitudes with a self-report questionnaire. With which of the following threats to validity should Max be particularly concerned?
A) Instrumentation
B) Mortality
C) Selection
D) History

Question

Quizplus · Accepted Answer

Max should be particularly concerned with the threat to validity of history. This is because the in-service training occurred on a single day, and external factors such as news events, changes in the school or community environment, or personal experiences of the teachers may also impact their attitudes towards inclusion after completing the questionnaire. Therefore, it would be difficult to draw a clear causal relationship between the training and changes in attitudes without controlling for these external factors.

Max's Study Compared the Differences in Teachers' Attitudes About Inclusion