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While such items sound useful, they're actually expensive to sort, to transport and to distribute, she said.

虽然这些东西听起来很有用，但在分类、运输和分发上他们却非常昂贵，她说。

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When grouping items that you want to compare, check that the comparison is relevant, valid, and provides some useful feedback to the business rather than explaining what happened in the past.

在对想要进行对比的条目进行分组时，需要检查对比是否相关、有效并且这个对比提供了对业务的一些有用反馈，而不是解释过去发生的事情。

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At Gadget Camp, sponsored in part by a foundation affiliated with the Fabricators and Manufacturers Association, girls learned how to make a lamp, a candy dispenser, and other useful items out of various materials including wood, metal, fiberglass and PVC pipe.

FORBES: Every Girl Should Wear A Tool Belt And Safety Goggles

However, they can learn big lessons from these mistakes that can carry into adulthood like lessons about spending versus saving, shopping wisely, negotiating for items and other useful financial skills that can serve them for the rest of their lives.

FORBES: How Much You Should Pay Your Kids For Allowance

They will fetch and carry parts, hold things, pick up tools, sort items, clean up and make themselves useful in myriad other ways.

ECONOMIST: Automation