The Story-and-Simulation (SAS) approach is one of the few scenario development methods
to tackle head-on the problem of combining the quantitative and qualitative aspects of
scenarios. It does this by iteratively developing scenario storylines and scenario models,
starting with the scenario storylines.
As originally proposed, it appears to be designed for relatively large projects
However, it is suitable for a wide range of project sizes with minor modifications.
A scenario team (which coordinates the exercise)
A scenario panel (which provides creative input and ensures a wide range
of views are represented)
A modelling team (which quantifies the scenarios)
The scenario team and scenario panel are established.
The scenario team proposes goals and an outline of the scenarios.
The scenario panel revises goals and outline, and constructs zero-order
draft of storylines.
Based on the draft storyline, the scenario team quantifies the driving forces
of the scenarios.
Based on the assigned driving forces, the modelling teams quantify the
indicators of the scenarios.
At the next meeting of the scenario panel, the modelling team reports on the
quantification of the scenarios and the panel revises the storylines.
Steps 4, 5 and 6 are repeated until an acceptable draft of storylines and
quantification is achieved.
The draft scenarios are distributed for general review.
The scenario team and panel revise the scenarios based on results of the
The final scenarios are published and distributed.
 Alcamo, Joseph. 2001. Scenarios as Tools for International Environmental Assessments,
Environmental Issue Report No. 24, Experts Corner Report: Prospects and
Scenarios No. 5, European Environment Agency. Copenhagen: EEA.