Big tasks that require multiple steps that each may have different ways to tackle it. Think about Hal in Malcolm in the Middle trying to change a lightbulb but attempting every other thing he comes across along the way because it inconvenienced the previous action. Those with ADHD can run these possibilities and things that need to be to be done first to make another thing more efficient or easier in their head, along with every currently thinkable permutation of how they can be done. We struggle with finding where to draw the line and to decide to leave the plan and just act upon how it is at the moment. It can be very overwhelming and that’s before an action has even been taken.