HOW?  Write up a prose scenario that describes how social and/or technological trends might influence people's behaviour and the use of a product, service, or environment.

WHY?  Predicting changes in behaviour, industry, or technology can help clients to understand the implications of design decisions.

(e.g.  In an effort to describe how changes in work behaviour might affect design strategy, the IDEO team wrote up forecasts to consider future circumstances or contexts of office spaces.)