A user interface should be so simple that a beginner in an emergency can understand it within ten seconds.

Everything is deeply intertwingled.

Everybody has only a 24-hour day. Most people, if they increase consumption of one medium (like magazines or books) will cut down on another (like TV). This drastically reduces the sort of growth some people have been expecting.

I see Professionalism as a spreading disease of the present-day world, a sort of poly-oligarchy by which various groups (subway conductors, social workers, bricklayers) can bring things to a halt if their particular demands are not met. (Meanwhile, the irrelevance of each profession increases, in proportion to its increasing rigidity.) Such lucky groups demand more in each go-round - but meantime, the number who are permanently unemployed grows and grows.

Learning to program has no more to do with designing interactive software than learning to touch type has to do with writing poetry

The problem is not software 'friendliness'. It is conceptual clarity. A globe does not say, 'good morning'. It is simple and clear, not 'friendly'.

The ideas keep going, you have the material, you cut because there's a limit to the space allowed to you. And the space is limited because of some other constraints that have to do with money or printing or whatever.