The Rating changes after each closed Task. However, the Rating is recalculated once in 24 hours and that is the reason why you may not see the change right after the Task completion. Only the Tasks completed during the past 6 months are taken into account. The Rating depends on the Task price and the result. If the Buyer confirms the Task results and pays for the Task, your Rating will increase. If you fail to perform the Task, the Task is sent to the Dispute Department and it is solved in the Buyer's favor, your Rating will decrease. As a result, the higher the Task price is and the more Tasks you complete successfully, the higher your Rating is.