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When I got my TW certification at the UW I spoke to one of the professors
She said that if you want to teach then yes, get your Masters.
However, it will not help you much in the workplace.
The certificate program is well respected and is *only* one year (man was it
a hard year!) of evening classes twice a week. It helped to get me my last
TW job and my present one, too.
And from here on the experience you already have, together with the quality
of your work that you can display, will often count for whatever academic
background you may be "lacking."
Of course, I recently completed a B.S. in TW, and I'm currently enrolled in
9 hours of graduate classes at night, so perhaps that says I don't put much
stock in my experience or the quality of my skills. ;)