When taking psychology tests roll 2D6 and compare the result to your Leadership (Ld) value. If the result is less than or equal to the unit's Leadership score the test is passed and all is well. If the result is greater than the unit's Leadership score then the test is failed.
Players will immediately realise that a psychology test is taken in the same way as a Break test in hand-to-hand combat and uses the same characteristic, namely Leadership. However, a Break test is not a psychology test. The two tests are quite separate. This is important because some bonuses apply specifically to Break tests and others apply specifically to psychology tests.