The latest attempt by the STC to promote a certification program for technical communications prompts the thought that technical communication is not a commodity.
What does it mean to say that a profession is, or is not, a commodity? A commodity is any good which will provide the same quality and performance no matter which supplier you buy it from. Gasoline is a commodity. Sugar is a commodity. No matter which brand you buy, your car will run just as well and your tea will taste just as sweet.
A profession is a commodity if you will receive substantially the same service no matter which member of the profession you use. Accounting is a commodity. Your books should be substantially the same no matter which accountant prepares them. Technical writing is not like that. Ask two technical writers to write something on the same topic, and the results are apt to be substantially different.