It is worth recapping why the making of good decisions is hard. In the following, I have brought together ideas from various sources and documents and my own materials that I have collected and put together over the years, grouped into 5 main categories.
Belief in the Sufficiency of an Existing Approach
The biggest challenge to making good decisions is the belief that one already is or will make a good decision.
Presence of Multiple Objectives, Criteria and Stakeholders
There can be a challenge to formulate problems appropriately for analysis. For example, to distinguish what items are objectives (and therefore a priorities) from those that are constraints (and therefore may not be met in a final proposed solution). Whereas it is known that in linear continuous optimisation problems, all constraints are met at the optimal solution point, this is not the case for most practical problem in business, which have some non-linear or discrete characteristic.
Biases in Decision-Making, analysis or Preferences
Lack of Feedback (Objective Results Analysis)