Final answer:
The statement that is not true about metrics and models is that models are measurements representing performance levels of important variables in an organization. Therefore, the correct option is D.
Step-by-step explanation:
The statement that is not true about metrics and models is d. Models are measurements representing performance levels of important variables in an organization.
Metric is a measurement representing the performance level of important variables in an organization, while a model is a representation of something that is often too difficult to study directly. Models are useful for studying complex systems or systems that humans cannot observe directly, but they are not measurements themselves.