The world is complex, and so too must be the activities that we perform. But that doesn't mean that we must live in continual frustration. No. The whole point of human-centered design is to tame complexity, to turn what would appear to be a complicated tool into one that fits the task, that is understandable, usable, enjoyable.

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

AS for all those mistakes I make - they are on purpose - to teach you how to deal with them

The current paradigm is so thoroughly established that the only way to change is to start over again.

User-centered design means working with your users all throughout the project.

Knowing how people will use something is essential

I think there is a tendency in science to measure what is measurable and to decide that what you cannot measure must be uninteresting.