What term describes the efficiency of unit performance based on observable experiences?

The term that best describes the efficiency of unit performance based on observable experiences is subjective evaluation. This term refers to the assessment of performance that incorporates personal observations, judgments, and interpretations rather than relying solely on numerical data or established metrics.

In military contexts, subjective evaluations often draw from the firsthand experiences of leaders and personnel who can observe how units operate, adapt, and succeed in various scenarios. This holistic view enables a more nuanced understanding of a unit's capabilities and effectiveness beyond what numbers can convey.

Other terms present in the question, while relevant in various contexts, do not directly align with the concept described. Quantitative measures refer to data that can be counted or measured and may provide insights but do not encompass the experiential component. Operational readiness typically focuses on technical and tactical preparedness for missions rather than efficiency based on experiences. Strength assessment might evaluate the capability or size of a unit but lacks the focus on performance efficiency drawn from observations.