There are, basically, three major types of scenarios – trend based, contrasted and normative scenarios – linked to probable, possible and desired/undesired futures. Business decisions can be framed and justified through the use of trend-based scenarios (the most probable type in the future business or decision context) and normative scenarios (visions or challenging scenarios). With contrasted sets of scenarios, the decision context can be explored, existing concepts and other factors be evaluated, and better decisions be made. Sets of contrasted scenarios are usually what we talk about when we discuss scenario planning, and it is this type of scenario that is considered in this book.