Trend IMPACT Analysis (TIA) METHOD, WAS FIRST INTRODUCED BY THEODORE J. GORDON IN EARLY 1970S, AT THAT TIME FORECASTING WAS MOSTLY DONE BY QUANTITATIVE METHODS BASED ON HISTORICAL DATA AND VIA Trend EXTRAPOLATION, THESE TYPES OF METHODS, HOWEVER, IGNORED THE IMPACTS OF UNEXPECTED EVENTS IN THE FUTURE. THIS PROBLEM IS APPLICABLE TO ALL QUANTITATIVE METHODS THAT ARE DEPENDENT SOLELY ON HISTORICAL DATA (FROM TIME-SERIES TO OTHER COMMON METHODS). TIA METHOD, BASES ITS FORECAST ON THE QUANTITATIVE METHODS BUT TRIES TO IMPROVE THE BASIC FORECAST BY USING EXPERTS OPINION (DELPHI METHOD IS MOSTLY USED) ABOUT PROBABLE EVENTS IN THE FUTURE. TIA IS ONE OF THE MOST WIDELY USED METHODS IN FUTURES STUDIES, WE CAN USE THIS TECHNIC FOR FORECASTING, CONTINGENCY PLANNING, POLITICAL FEASIBILITY Analysis, STRATEGIC PLANNING AND SCENARIO WRITING.