First, a colleague is supposed to be efficient in work. When given a task by the boss, all the team members should take their duties and cooperate well in order to finish it quickly. If one of the colleagues is slow and left behind, a project will be delayed.  

Secondly, I think a colleague should be ready to help others. When a new employee comes to the company, he knows little about the work, so it is his colleagues who are supposed to help him. But there are some staff members who wouldn’t like to help others, for they are afraid that others will excel them afterwards. Certainly, it has a toll on the company.  

Work is a serious business, and must be approached with a serious attitude. An office worker should has a serious attitude if he want further promotion. 

On the whole, in the modern society, all colleagues have to cooperate with each other. So these characteristics are of great importance.