Thanks, Eduardo. According to the ACMP press release from October 2014 when The Standard was announced:
“ACMP’s Standard was developed through a global, voluntary consensus standards development process, consistent with ISO (International Organization for Standardization) practices. Over the course of two years, ACMP’s Standards Working Group engaged over 1,100 change management thought leaders and volunteers from 57 countries, each averaging more than 10 years’ experience, to capture, review, adjudicate and respond to more than 3,500 unique comments.”

The Standard for Change Management can be downloaded for free here: http://www.acmpglobal.org/?ACMPStandard (registration required).

How was it determined? What information (Change implementation experience?) was it used to determine the standard?

Has it ever been achieved?

I am interested.