Dunning Kruger Effect

An aside here.  I have only recently come across of the Dunning-Kruger syndrome. This is defined as:

The Dunning-Kruger effect describes a cognitive bias in which people perform poorly on a task, but lack the meta-cognitive capacity to properly evaluate their performance. As a result, such people remain unaware of their incompetence and accordingly fail to take any self-improvement measures that might rid them of their incompetence.

What a useful concept.