The Waterfall Model is wrong and harmful; we must outgrow it.

Software and hardware design is less different than software designers think, but more different than hardware designers think.

To only a fraction of the human race does God give the privilege of earning one's bread doing what one would have gladly pursued free, for passion.

Successful software always gets changed.

Software work is the most complex that humanity has ever undertaken.

The critical thing about the design process is to identify your scarcest resource. Despite what you may think, that very often is not money. For example, in a NASA moon shot, money is abundant but lightness is scarce; every ounce of weight requires tons of material below. On the design of a beach vacation home, the limitation may be your ocean-front footage. You have to make sure your whole team understands what scarce resource you're optimizing.

Product procedure...must securely protect the crown jewels, but, equally important, it must eschew building high fences around the garbage cans.