The most recent research into decision-making suggests that the most effective leaders are the ones who are able to adapt their decision-making style over time as their roles and responsibilities change. Discover a proven, easily understandable way to assess decision-making style with the Decision?Making Style Inventory. The Inventory offers a proven, easily understandable way to assess decision-making style. The Inventory measures two dimensions of decision-making: Two structural styles?Systematic and Spontaneous, and two processing styles?Internal and External. The 20-item Inventory determines which of four styles is an individual?s preferred style. It is a powerful tool that can be used in numerous developmental situations such as formal leadership training, coaching, and even performance appraisals. Use the Decision-Making Inventory Participant?s Workbook in conjunction with the Inventory to determine your decision-making style.