In this presentation, the great Daniel Dennett explains how comprehension is often not a prerequisite for competence. In nature, comprehension is not the cause of competence but the effect. Natural selection, over many generations, shapes characteristics into organisms which makes them competent without them realizing why they are competent. There is no evolutionary advantage to shape understanding into the organism of why the characteristic is so beneficial; the characteristic itself is enough. "Your butterfly that has eye spots on its wings does not have to understand why this is a good thing for it to have. It scares off the birds but it is none the wiser."
A nice example of competence without comprehension which Dennett gives, is how Polynesian boats are developed and improved "Every boat is copied from another boat ... it is the sea itself who fashions the boats, choosing those which function and destroying the others." "If it comes home ... copy it! That's natural selection."
How does this relate to the solution-focused approach? Doing what works is one of the key principles of the solution-focused approach. One assumption we have is that understanding why something works is less important than knowing it works in the first place. Often, we identify things that work, and we can use them, but we are not completely sure why they work. We may have some ideas about why something works, but sometimes we may have no clue at all. Still, this does not keep use from doing what works.