As a Nurse Manager,you Trial a New Pain Scale on Your

As a nurse manager,you trial a new pain scale on your unit that is supported by numerous research studies.You compare the patient outcomes with the new scale against the existing scale.Feedback from staff suggests that the new scale is too difficult for patients who have limited language skills and who are already under duress to understand.The difficulty in implementing the new scale refers to testing:

A) efficacy.
B) effectiveness.
C) practice failure.
D) comparative error.