In cases of partial vesting, a "vesting schedule" is a table or chart showing the portion of a right that is vested over time; typically the schedule provides for equal portions to vest on periodic vesting dates, usually once per day, month, quarter, or year, in stairstep fashion over the course of the vesting period. Often there is a cliff by which the first few steps in the graph are missing, so that there is no vesting at all for a period (usually six or twelve months in the case of employee equity), after which there is a cliff date upon which a large amount of vesting occurs all at once.