[The major cause of the software crisis is] that the machines have become several orders of magnitude more powerful! To put it quite bluntly: as long as there were no machines, programming was no problem at all; when we had a few weak computers, programming became a mild problem, and now we have gigantic computers, programming has become an equally gigantic problem. Edsger Dijkstra: The Humble Programmer
Ein Modell ist ein beschränktes Abbild der Wirklichkeit. Dies kann gegenständlich oder theoretisch geschehen. Nach Herbert Stachowiak ist es durch mindestens drei Merkmale gekennzeichnet