Why is it that so many managers have missed this crucial lesson?

Apparently, this slide is not shown until after lunch on day 1 of Management 101.

And most of the would-be managers got so drunk at lunch that they delegated the afternoon sessions to their Personal Assistant instead.

Career-Saving Disclaimer: This does not depict any of my current managers. This just depicts a manager that someone told me about once. Yeh. A friend of mine. Who worked somewhere else.

Here's a bigger version:

Here's a US-english version for my linguistically dis-enlightened cousins:

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It gives you 4 easy steps to find and validate a humble product idea.

Learn more.