which is one performance measure (KPI) indicating your organizational strength?

As there are many methodologies and key performance metrics (KPI)  to assess the organization strength. In fact, no one measure does not indicate the complete picture of the organization.

However, as a business head, if you want to gauge quickly about your organizational capability, people working culture, communication process and likely future prospects of the business, one key performance indicator will show you the strength of the organization.

That is " Delivery Actualization"  or "Customer order fulfillment on time."

Given the order position, if your organization meets  "Delivery commitment 100 % every time and that too on time, then we can presume, the organization is built on people and process strength.

why we insist this measure is dipstick measurement to assess the organization strength :

Irrespective of each functional efficiency, only when there is a cohesive team, business process and daily management practices, and capability, then the organization can deliver on time with 100 % actualization. This KPI  indirectly measures the organizational strength.

Relook at your organizational performance on order fulfillment for last one year, and you can relatively understand your organization's strength!