Principles of design:
1. Use both knowledge in the world and knowledge in the head.
2. Simplify the structure of tasks.
3. Make things visible: bridge gulfs between Execution and Evaluation.
4. Get the mappings right.
5. Exploit the power of constraints.
6. Design for error.
7. When all else fails, standardize.

Will robot teachers replace human teachers? No, but they can complement them. Moreover, the could be sufficient in situations where there is no alternative––to enable learning while traveling, or while in remote locations, or when one wishes to study a topic for which there is not easy access to teachers. Robot teachers will help make lifelong learning a practicality. They can make it possible to learn no matter where one is in the world, no matter the time of day. Learning should take place when it is needed, when the learner is interested, not according to some arbitrary, fixed schedule

While a few manufacturing industries--in particular, the auto industry -- face challenges, the overall manufacturing sector appears to be on very solid footing for at least the near term.

This forward-looking index indicates broad optimism that the expansion of manufacturing activity will continue throughout the year.

Just 8% of the respondents reported that backlogs are down from last year, while 66% said that backlogs are higher.

The profit margin index is well above the 50%-level, indicating that, for most firms, profit margins are higher than one year ago, when margins were showing improvement from their depressed levels throughout 2001-2002.