Debunked, apparently.  Ran across a reference to the Losada Line in The Happiness Advantage today – the idea that for you (or your team) to flourish, you need roughly 3 positive interactions for every negative interaction.  2.9013 positive interactions, to be precise.

Quote:

We do not here call into question the idea that positive emotions are more likely to build resilience than negative emotions, or that a higher positivity ratio is ordinarily more desirable than a lower one. But to suggest that some form of discontinuity sets in at some special value of the positivity ratio — especially one that is independent of all demographic and cultural factors — seems far-fetched. We cannot, of course, prove that no such “tipping point” exists; but we believe that we have adequately demonstrated here that even if it does, Fredrickson and Losada’s (2005) article — based on a series of erroneous and, for the most part, completely illusory “applications” of mathematics — has not moved science any nearer to finding it.