> At what point, and how do you determine that? By looking at the research? By understanding what kind of studies and experiments are actually viable? By evalu

> At what point, and how do you determine that? By looking at the research? By understanding what kind of studies and experiments are actually viable? By evaluating what we can measure effectively, what we can't, and how good (or bad!) our proxy metrics can be? As a field, we really need to understand the inherent limits of quantitative methods.