ADHD individuals do not work well on non-self-selected tasks (they can, though, just like anybody else, spend hours doing what they truly like). How do you increase task engagement of a brain that is notoriously unable to focus on what is important?
Individuals with self-regulation challenges like ADHD need clear and realistic goals. Sounds straightforward and realistic in theory, but achieving performance is another matter. To court success, avoid tasks that set only a vague general direction but no specifics. An ADHD brain functions better when tasks are broken down into a set of nuclear (further indivisible) actions — steps that are short and clear and cannot be questioned in terms of “how” as every “how” is an attention-killer. Remember, ADHD is not so much about not knowing what to do, but of actually doing what you know.
For example, issuing the order “clean your room” to someone with ADHD is most likely pointless. That directive brims with dozens of “hows,” “whats,” and “whys” built into it, which will divert attention, overload working memory, increase the psychological cost of action — and may ultimately lead to failure.