Assignment system
There is no assignment system. But it was announced in early 2010 as part of the mission system.
Official announcement
Assignment System upcoming
As Marco has mentioned before, we’ve been working on a new quest system which we call Assignments. With the Assignment-system we are hoping to achieve a smoother way to integrate the storyline of Calypso, and let people have a personal relation to the Calypso lore. It will also be another way for the colonists to get into the economy.
A preview of the system with just a few assignments is planned to arrive in FPC’s content release in the middle of February. And when it hits, we would really appreciate feedback from you lot. We are going to put up a survey about the assignment-system to get an overview of your general opinion, so I ask you to please take your time to fill it out.
For starters the assignments are going to be for the newcomers and lower skilled avatars, but soon we will also implement assignments for all levels.
Source: http://www.entropiagateway.com/2010/02/assignment-system-upcoming/ (unfortunately gone)