A large inspiration for the Wardley Mapping method comes from Sun Tzu's The Art of War, and from John Boyd's OODA Loop. The five factors of competition described there were Purpose - Landscape - Climate - Doctrine - Leadership. 
Purpose tends to be a long-term stable feature of a business, but it does have the potential to change as a result of changes in strategy:
Purpose is your moral imperative, it is the scope of what you are doing and why you are doing it. It is the reason why others follow you. . . . Whilst the art of strategy is deciding "why here over there" and this in turn requires you to understand the possible wheres (i.e. your landscape), the consequence of making a decision can alter your purpose.