No. The very first thing you learn in research methods when you start a Ph.D. is that the most important thing about doing an intervention is properly identifying the problem. There are three ways to attack a problem. One is empirical, going to the literature—although not everything is in the literature. Two is theoretical. You look for a theory that supports what you're going to look at, and you try to use that as your framework. The last, and probably the most important thing, is experiential, going to the people for their story of the problem. Those are the three ways you properly define your research problem. You do not just do a literature search, only look at randomized control trials, and toss out case studies because they're the lowest form of evidence, but sometimes that's where you have to start. It's the theoretical, empirical, and experiential definition of a problem.
On March 22nd, 2018. See this statement in context.