One principle to assign task to team members.

Today, I made a mistake while assigning a task to one of my team members.  For I had talked with him about what I wanted, so in the mail I gave to him, I just listed tasks' content, and not gave task priotities.  Then that guy thought I wanted him to start all the tasks right now and forgot completely our talking before my e-mail.  And then we lost nearly one day from my project time resource.


So one important principle to assign task to team members is:
    Never lost what you DON'T want you team members do for the tasks.