Harold S. Becker was an early proponent of the scenario approach, and was
a cofounder of The Futures Group. In 1983 he published a paper in
Technological Forecasting and Social Change describing scenarios
as an important new tool . His steps for preparing scenarios,
as presented in that paper, are reproduced below.
Unspecified/flexible (although he refers to an author, so he may
have a lone scenario analyst in mind).
Select the basic characteristics: the few conditions most important to shaping the
system or marketplace being studied.
Set the possible range of values that will be studied for the basic characteristics,
if possible, in quantified terms.
Select the number of scenarios that will be studied: combination of the basic
characteristics that are internally consistent and sufficiently plausible.
Designate the indicators and trends that will be treated in each scenario.
List important events: developments necessary for the conditions of each scenario
to come about and those important to shaping the indicators and trends.
Estimate probabilities of each event in each scenario and impacts of each on the
indicators: likelihood of occurance and influence on each indicator.
Project the indicators: quantified values vs. time.
Prepare narratives: describe evolution of conditions in each scenario spotlighting
key events/developments, important trends, implications for the system or marketplace
studied and, where possible, implications for strategies, policies and actions.
 Becker, Harold S. 1983. Scenarios: A Tool of Growing Importance to
Policy Analysts in Government and Industry, Technological Forecasting and
Social Change, 23, 95-120.