The five power bases are more of an ideal type. In reality, most effective leadership decisions with sustainable outcomes result from a combination of various sources of power. For instance, assuming leadership position for ones wisdom, knowledge and skills, the "expert" or on "referent" bases, can give entry/access to leadership position but for the decisions to be effective, this leader will have to gain "legitimate" right to power and and have ability to reward others who offer submission in result. Coercive is the least effective basis.
The leader who has a visionary style of decision making has the natural aptitude for quick action. He doesn’t wait for too much of information and analysis, goes straight to the core of the matter, relying on his own intuition more.
This decision style is apt for decision making during crisis management but can be hugely biased if regularly resorted to. Hence, the visionary thinker has to gather information from various sources and has to seek opinions of various stakeholders of the business to balance his own views.
Decision making is a critical process for all the individuals, all the organizations. Every decision tells us something about the person who took it and how he took it. Generally, decision making is neither an exact science nor pure art. Rather, it’s the fine balance between the two.
Any decision taken is a culmination of many processes involving defining the exact nature of the problem, gathering information and analyzing it to arrive at a conclusion. But, a person or persons involved at all these steps have their mindsets, preferences and biases and baggage of past experiences which influence the decision making the process to a huge extent. It is difficult to eliminate these influences completely from the decision making processes.