Some of my guidelines for chairing workshops or editing special issues and books:
4 eye principle
Basically it requires, that each message sent to either authors or reviewers should be read by a second person from the chairing committee. This is also called the A-hole check, as it is supposed to prevent sounding like a complete A-hole. I accidently sent out a reject message like this once:
Zu dieser Seite gibt es keine Dateien.
[Zeige Dateien/Upload]
Kein Kommentar.
[Zeige Kommentare]