the translation brief

the translation brief
如下面这段话中的translation brief ：
In Skopos,there is a very important term,translation brief,which originates from a German word
“Ubersetzungsauftrag”.It implicitly compares the translator with a banister who has received the basic information and instructions from his client but is then free(as a responsible expert)to carry out those instructions as he sees fit (Nord2004:30).Although translation brief does not tell the translator how to embark on the translating job,what methods should be applied and how to solve quantities of problems,it gives him a general idea how a source text should be translated.