What is Decision Making?

In its simplest sense: 'Decision Making is the act of choosing between two or more courses of action'.  

However, it must always be remembered that there may not always be a 'correct' decision among the available choices.  There may have been a better choice that had not been considered, or the right information may not have been available at the time.  Because of this, it is important to keep a record of all important decisions and the reasons why these decisions were made, so that improvements can be made in the future.  

This also provides justification for any decision taken when something goes wrong.  Hindsight might not be able to correct past mistakes, but it will aid improved decision making in the future.