Before the publication of the ‘Gang of Four’ book that popularised software patterns [4], Richard Gabriel described Christopher Alexander’s patterns in 1993 as a basis for reusable object‐oriented software in the following way:Habitabilityisthecharacteristicofsourcecodethatenablesprogrammers,coders,bug­fixers,andpeoplecomingtothecodelaterinitslifetounderstanditsconstructionandintentionsandtochangeitcomfortablyandconfidently.