Part of the reason that the conceptualization stage (see Chapter 3) is so important in research is because of the imperative in writing up studies to 'make the case' -providing readers with a coherent argument that convinces them that the conclusions drawn from a research study (and so the implications for practice that may be recommended) are based sound logic.
It is in the nature of a logical argument that any one single flawed link undermines the whole argument.
Yet most research studies are in themselves only able to explore and report a single aspect of an issue.