The problem with time blocking is that it kills your flexibility.
Let me first state the "canonical" GTD organization, how you would place this going by the book. There is a section about the
natural planning model in regards to
projects where it states that after
purpose and
successful outcome, the next thing to clarify would be the
working principles and guidelines, values, limitations etc to be observed while working the project.
Here you would state something like "want to work on this project on every week day" and thus you had the "official" reason to schedule that project in your calendar or tickler functionality.
So that would be the shortest answer. Your GTD system reflects to you that you wanted to work every day on that project.
The whole thing could also be a Level 4 vision thing "In the evening I work in my studio on some web devel stuff." So, once there you take a look at the @studio context list.
You can also time block specific next actions, e.g. "complete site-wide basic CSS files"
But this is all about calendaring stuff and sure it works, if it works, but what if it didn't and so on.
The question is more, why would you want to plan your day?
- because otherwise I fear to fall behind ie. to work too slowly
- I procrastinate on the daunting but important tasks
- I tend to wander off…
…are some of the more common answers.
Years ago I read
"The War of Art" by S. Pressfield, because D. Allen had recommended it as a good companion to GTD and I agree. I also read
"Secrets of Productive People" by M. Forster, which I would also recommend as companion to GTD.
Both authors come to the same conclusion in regards to those
daunting but important tasks: establish routines, do these tasks routinely.
This is also what I am (trying) to do. I start GTD projects for establishing routines.
Some important thing I should work on everyday, that is worth a routine, isn't it?