Hi LynnRD - I am T1D for 48 years. I don't focus as much on the tasks, as I do on the end results / goals. I think you are hinting at that when you mention the value of the task. For me, my main goal is achieving the best BG control, by making task by task decisions that more likely will lead to better BG control. If the PWD doesn't start with the belief in their heart that BG control is important, then I can see how it's easy to not do the tasks. I did that for many years in the 80's, until I lost some vision due to retinopathy. In the 90's the DCCT studies proved that better BG control reduces complications, and it finally sunk in for me. Having improved tools such as BG test meters, carb counting, MDI, then insulin pumps/pens/faster insulins and now CGMS have provided more and more motivation to me to strive for and achieve better BG control.
So if the task is choosing which foods to eat, my self-talk is, which food and how much will lead to better BG control. If the task is to do more BG checks, my self talk is, will knowing my BG help ME evaluate my choices, and possibly do something different next time. (Too many people simply test without knowing how it can help them, but test just because the Dr told them to test.) Etc, Etc. If I evaluate simply the task itself, without aligning it to a goal (value) I believe in, then I'll likely not do the task.
But I don't measure the results task by task, since as Brian noted, sometimes we do everything right, and the numbers just don't line up. It's easy to say "What's the use, I could get the same result by eating the chocolate cake or pizza"! Most of us come to some acceptance and expectation of that, and don't give up when it happens, or beat ourselves up. We also give ourselves an occasional treat, and be ok with sometimes missing our targets.
I believe DOC, and TuD are important and helpful tools, but might not be for everyone. There can be conflicting advice, and sometimes inaccurate advice suggested. Posters offer solutions when they misunderstand, or know minimal details about the individual asking for help, and the suggestions may be inappropriate. I think in general, TuD is pretty good at having posters that contradict or correct a previous posting, or offer alternatives, but that can potentially overwhelm or confuse someone new to diabetes/DOC format.