Measurement of variation in health care and its application to quality improvement must begin with the identification and articulation of:

Measurement of variation in health care and its application to quality improvement must begin with the identification and articulation of:
A . What is to be measured?
B. Assignable variation
C. The standard against which is to be compared a process based on extensive research, trial and error and collaborative discussion
D. Understanding true variation versus artifact or statistical error

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Answer: C