Whilst looking for something entirely different, I came across this post on Lifehacker about advice given by Jerry Seinfeld to an aspiring comic:
He told me to get a big wall calendar that has a whole year on one page and hang it on a prominent wall. The next step was to get a big red magic marker.
He said for each day that I do my task of writing, I get to put a big red X over that day. “After a few days you’ll have a chain. Just keep at it and the chain will grow longer every day. You’ll like seeing that chain, especially when you get a few weeks under your belt. Your only job next is to not break the chain.”
“Don’t break the chain,” he said again for emphasis.
I’ve realised that this is, in effect, what I’ve been doing with Joe’s Goals: