In this article, we interrogate the concept of methodological 'failures' as they arise during fieldwork, in the process of collecting empirical data. We highlight how the techniques of validity horizon matrices and power analysis can be used as methodological tools to illustrate moments in the fieldwork process where these 'failures' occur and to…

The instructional lab setting has been found to be dominated by prescribed tasks and pre-prepared lab kits. This was explained by teachers' need to guide students to simultaneously progress through a lab curriculum, which prompts them to standardize the lab experience. Nevertheless, prominent professional associations have persistently called to…

This study dealt with analysis of the study units in the textbook "Horizons" for 9th-grade students studying English in mixed ability classes. The study sought to examine the variety in the cognitive level represented by the WH-questions in the textbook according to Bloom's taxonomy. The study also attempted to examine the extent in…

The study dealt with a research environment in which the treatment effect is heterogeneous, and in which individuals use their assessments of the treatment effect to decide whether or not to enroll in an intervention program. In this article, a new methodology is proposed for examining the validity of the specified research environment in a given…