Professional Certification: Evolution, Revolution, or Status Quo? 
The issue of professional certification for technical communicators has reappeared in recent years and prompted the Society to begin another formal study of the question. Certification is a form of voluntary credentialing developed and administered by private, typically non-profit, organizations. Certification’s value to STC and the profession is the focus of the Society’s current study. Using information compiled from focus groups, surveys, and literature reviews, the Certification Issues Committee has begun an RFP for a comprehensive feasibility study of certification.
Kunz, Lawrence D. and Terrance M. Skelton. STC Proceedings (1996). Careers>Certification>TC