There is a fantastic talk by Kevlin Henney where he deconstructs the SOLID principles as each being either misunderstood when they were written - or frequently

There is a fantastic talk by Kevlin Henney where he deconstructs the SOLID principles as each being either misunderstood when they were written - or frequently misunderstood after. It was done here: https://vimeo.com/157708450 https://vimeo.com/157708450 I won't spoil it by writing all the points here - just some pearls. * The Open/Closed principle is redundant because it is already covered by the Liskov substitution principle. * Bob Martin's view of the Dependency Inversion principle is in fact the Single Responsibility principle. He suggests 5 more principles - but I won't spoil it by listing them here. Go see it!