When a device as simple as a door has to come with an instruction manual—even a one-word manual—then it is a failure, poorly designed.

Also note that invariably when we design something that can be used by those with disabilities, we often make it better for everyone

Isn't one of your first exercises in learning how to communicate to write a description of how to tie your shoelaces? The point being that it's basically impossible to use text to show that

Technology may change rapidly, but people change slowly. The principals [of design] come from understanding of people. They remain true forever.

Having the best product means nothing if the people won't buy it.

A good designer will actually design the company.

Learning should take place when it is needed, when the learner is interested, not according to some arbitrary, fixed schedule