just as if , if we are in a sort, team leader or a section head as i've shown, it doesn't mean to say that we hold all the knowledge, we can pass it on to others, who can he pass it on to somebody else  although you ultimately may be responsible for the training of other people, you don't need to do it all yourself do you, but unless you pass on skills, you're gonna make a sort of a quite a vicious circle for yourself aren't ya?