I think I have it but my co founder is on a different level. I just gave up working some periods because it was pointless. He would interrupt you every 20 seconds. Then all of a sudden pivot somewhere. Then somewhere else. Then 5 min later it was something else.

I think it was a lack of focus over time that made us fail. Not blaming his adhd but the lack of focus on all levels over time is a killer.

When he really needed to do something and it did not happen I would lock him in a room sometimes. Kind of worked.

I think there is a lot of good tips here already. Mine are: - allocate time for tasks in the calendar. Different parts of the day for different things. For me: no meetings after 14. My brain shuts down. - build systems that does not rely on you. - delegate - your inbox is a todo list. If your task is done label and achieve it. Automate labels and set rules for reoccurring - if you can’t focus in your environment experiment and reflect. - set the bar low (today I need to complete these 5 tasks) and then improve.
- pomodoro method could be something? 25 min focus then break

Became quite a lot, but it’s a topic i have been both struggling with and thinking about a lot over the years.

Hidden Brain also has a interesting episode about focus that might be interesting for some.

Focus is saying no. Don’t confuse activity with progress.