QUESTION: From: Muhammad I. Sent: Thursday, Feb. 28, 2013 To: ATCS Q-Blog Subject: How to Determine Effectiveness of Corrective Action Taken When dealing with a nonconforming situation, how can we ensure that API Q1 requirements for corrective actions have been adequately addressed?  Also, how can we determine that the corrective action taken was effective?  What evidence will be required to prove what we claim? RESPONSE: From: ATCS –Q-Blog, Ask the Experts Sent: Thursday, Feb. 28,