If you want people to do things "your" way, it is your responsibility to ensure that absolutely no one misunderstands
- What needs to be done
- Who needs to do it
- How--and, if applicable. where--it should optimally be done
- When it's due
- Why it needs to be done at all.
No excuses. You could learn that to pass an English class: Surely you can learn it when your management job depends on it.
That's all that really needs saying, I guess.