There are 2 reasons behind asking effective questions:
This site is a collection of resources to support the use of effective teacher questioning in formative assessment, otherwise known as assessment for learning. It is targeted at secondary teachers in NSW, Australia.
According to Dylan Wiliam, there are 5 key strategies to effective formative assessment:
This site will support teachers in using effective questioning to elicit evidence of learners' achievements.
For a summary of research on effective teacher questioning see Strong Start Great Teachers.
View the video below for a summary on the role of teacher questioning in gathering evidence for learning and to make students think.