Defining 21st century skills is an editorial matter. There are dozens of examples floating range with a range of authority behind them—some inspired, grassroots efforts, other core brands of multimillion dollar organizations making a national push.
There is even debate as to whether they are truly necessary, the idea being that learning habits and priorities are timeless, and do not change because the world itself changes. But the scale and rate of change are unrelenting.
Culture oozes forward.
Trends and movements emerge and overwhelm old habits.
Technology does its dizzying dance.
And learning has to change with it.