“There are two locales in a pitcher’s universe – on the mound and off the mound. When a pitcher is on the mound he [sic] should be thinking about only two things pitch selection and pitch location. If he finds himself thinking about something else, he should get off the mound.”

Harvey Dorfman

And so it is with software writers.

There are two locales in the software writer’s universe – in the code and outside the code. When a software writer is in the code they should be thinking about only two things, the line of code they are writing and the domain for which they are writing it. If they find themselves thinking of anything else, they should get out of the code. – sbm