As we know that assumptions give a lot of financial data, which supports for financial analysis when decide which kind of contract Compass Records should be sign with Adair Roscommon. The first assumption using Base Case Units Sold per Geographic Region and the second assumption using Base Case Percentage of Sales. All of two assumptions using some of detail is that not really reflects exactly what happen with Compass Records and mass media market, all of these based on predictable. So, it lead to some of uncertain about results the assumptions, which affect to much to decision making in investment (Ferderer, 1993). Some of the uncertain in the assumption is: uncertain in how many year product might be sold, how sales might fall quickly, how changing fast of sale by channel, how lucky and success Compass Records and Adair Roscommon might get, how growth of this industry in near future and so on. All of these uncertain lead to uncertain results of assumptions.