VERDICT
Should I use Nielsen Norman Group?
UX research, training, certification, and consulting from one of the field's founding firms. - nngroup.com
Depends. NN/g is the gold standard for UX research training and certification — worth it for practitioners or teams with a real training budget. Skip it if you expect a certificate alone to get you hired, or if roughly $3–5k per person outweighs your career stage.

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