Provide examples for each of the three barriers identified for strategic thinking i.e " Brief thinking, Failure to think critically as a result of lack of training,Lack of a well-established strategic planning methodology".

For example, how does 'brief thinking' manifests itself as an impediment to such thinking? Some may argue that under certain circumstances, brief thinking is the way to go in order to implement strategic thinking. How or why such line of thinking can be erroneous?