What-If-Analysis is the process of changing the values in Excel computation to see how the changes will affect the outcome of formulas/results on the worksheet. Understanding the implications of changes and the factors that cause the changes are crucial when it comes to analysing your data and making decisions. What would be the effect of an increase of costs, or if the turnover rose/fell by a certain amount? How would a change in interest rates or exchange rates affect your profits? Excel offers easy-to-use tools to save time calculating and help to make more accurate forecast. The four types of `What-if-analysis’ are the Data Tables, Scenarios, Goal Seek and Solver.