Bubble located at the upper - right coner is one ideal maturity level. Bubble located at the upper - left coner is one level with none sustainable one. Bubble located at the lower - left coner is one level with poor result without proper measures. Bubble located at the lower - right coner is one level with practices which seems good without suppoting good KPIs. Bigger bubbles stand for better correlationship between KPIs and BPs.