[fclaerho]

Agreed, that article could not be more vague.

I don't argue with the main point, which is "broaden your skills."

But the rest is debatable and not such good advice. Some of the items given in the "skill list" used as an example are absolutely unusable as it. "writing"? writing what, there's a huge difference between being able to write novels and writing technical documentation for instance. I also have a grip on "productivity", that's not a skill, that's the ability to apply a skill. A better pragmatic definition of a marketable skill, I think, would be the ability to write it on your résumé, and only a subset of the ones discussed in the article fit this definition.