I work with volunteers and they sign up for roles and take on responsibilities. They sometimes excel and sometimes struggle, and sometimes do both. That said, they need support, and guidance, even if this is something they have done for another group, or in their day life, they are probably new to our brand, our way of work or new to the concepts all together.
So during a training session instead of asking "Did that make sense?" and they say "yes" (or nothing at all) and you move on, you need to stop and try some of these types of questions to dig a little deeper to ensure what they are taking on, if they understand the critical role they are playing, and allow them to make connections too.
So what is Socratic Questioning?
Wikipedia states that Socratic Question is disciplined questioning that can be used to pursue thought in many directions and for many purposes, including: to explore complex ideas, to get to the truth of things, to open up issues and problems, to uncover assumptions, to analyze concepts, to distinguish what we know from what we don't know, to follow out logical implications of thought or to control the discussion.
Here's a slideshare taken from What Makes Effective Questioning.
It shows a list of 6 questions you can use in your work with your learners, volunteers and or staff to help develop critical thinking and really get a better sense of understanding of the material or the role.