Scenarios planning starts by dividing our knowledge into two broad domains: (1) things we believe we know something about and (2) elements we consider uncertain or unknowable. The first component – trends – casts the past forward, recognizing that our world possesses considerable momentum and continuity. For example, we can safely make assumptions about demographic shifts and, perhaps, substitution effects for certain new technologies. The second component – true uncertainties – involve indeterminables such as future interest rates, outcomes of political elections, rates of innovation, fads and fashions in markets, and so on. The art of scenario planning lies in blending the known and the unknown into a limited number of internally consistent views of the future that span a very wide range of possibilities. In project management, this is called the cone of uncertainty.