Here is an excerpt from an interesting article by Andy Halloway that gives employers information on how to deal with employees with ADHD. This is a good read for both adults with ADHD and for people who have to work with ADHD adults.
Threatening an ADHD-affected employee might work, if the threat is immediate, the consequence severe enough and the task inescapable. But that’s a horrible way for someone to live — and to manage. Yet some with ADHD do that themselves as a form of motivation. They effectively create an artificial sense of urgency by waiting until the deadline before springing into action.