Single-Period refers to the situation where an income or a cash flow measure applied in business valuation of investment is based on a single year. Under single-period analysis, forecasts of income and cash flow are not required because the analysis is based on one single year such as the last financial year or an average of the last three financial years. The reverse is the multi-period analysis where incomes or cash flows applied in business valuation or investment appraisal are derived from multiple periods (several years).