What is roster basis work?

Question

What is roster basis work?

Answer 1

It means - A list of names, especially of military officers and enlisted personnel enrolled in a particular unit;

So the work is related to maintain list of some people not always millitary officials.

2 meaning  a muster roll.

Answer 2

You work on a roster basis for example 2 days doing dayshift have a 24hr break and then 2 nights on nightshift or you may work 4 days on 4 days off.

Answer 3

According to www.reference.com, it means avaialbility to work from a rotating list; not on a regular schedule.