“If your schedule is disrupted, you should, at the next available moment, take a few minutes to create a revised schedule for the time that remains in the day. You can turn to a new page. You can erase and redraw blocks. Or do as I do: Cross out the blocks for the remainder of the day and create new blocks to the right of the old ones on the page (I draw my blocks skinny so I have room for several revisions).”