This seems like an important question but I admit I'm not sure what you mean—are you asking how to measure a designer's performance?

Thank you for the reply. Ya I'm relating to performance. When setting goals to designers, I find it difficult to measure their performance. I am interested in measuring, for example, design consistency, iteration throughput, collaboration efficiency with engineer, adoption, amongst others. Basically I want the process be more objective and rely less on intuition. Would love to learn how others do it