Ok here's one more, the "Rule of 1".
- Never deliberately change more than one thing at the same time, or the results won't make any sense and you won't have actually learned anything about how to improve your control. "The same time" means at least 3 days and probably more like a week.
There is an unfortunate corollary to this:
- If more than one thing changes at the same time, for reasons outside your control (illness, stress, temperature, insulin quality, infusion set, pump, needle, injection site, time of the month, phase of the moon, yada yada), then you are never going to figure out what caused the problem and you are never going to be able to fix it... :-(
[Edited to add:]
"Tim2000s' Rider":
... except by pure random chance and blind luck.