A business failure is always linked to a kind of personal failure. whatever the reason is, in private equity we know that out of 10 investments, just 2 will perform, 6 will underperform, and 2 will fail completely.
Now, out of 6 underperforming investments, personal issues, market problems, external issues will raise concern over the time. Only through a specific due diligence you will be able to correct the problem and move to acceptable results.