In corporate finance, in the context of discounted cash flow valuation, the forecast period is the time period during which explicitly forecast, individual yearly cash flows are input to the valuation-formula. Cash flows after the forecast period are represented by a fixed number - the "terminal value" - determined using assumptions relating to the sustainable compound annual growth rate or exit multiple. There are no fixed rules for determining the duration of the forecast period. However, choosing a forecast period of 10 years, for example, will not be meaningful when individual cash flows can only reasonably be modeled for four years; see Cashflow forecast. The number of forecasting years is therefore to be limited by the "meaningfulness" of the individual yearly cash flows ahead. Addressing this, there are three typical methods of determining the forecast period.