See the Galaxy They Say - Should Have Joined the Navy
In some situations, multiple characters working together have a better chance of completing the task than if a character attempts it alone. With the GM’s permission, a character can assist another character who is performing a test. Only the character who is actually performing the test rolls dice. Each character assisting reduces the difficulty by one step (see Table 7–3). If the test succeeds, the character performing the test gains an extra Degree of Success.