Le concept de la métaphore d'Extreme Programming est également un vieux concept

(...)We all know that the only mental tool by means of which a very finite piece of reasoning can cover a myriad cases is called “abstraction”; as a result the effective exploitation of his powers of abstraction must be regarded as one of the most vital activities of a competent programmer. In this connection it might be worth-while to point out that the purpose of abstracting is not to be vague, but to create a new semantic level in which one can be absolutely precise. (...)

Et oui, les 2 derniers post sont tirés de l'article The Humble programmer écrit par Edsger W. Dijkstra en 1972.  C'est fou comme un invente rien...