Some talent development professionals skip Level 2 evaluations thinking Levels 3 and 4 are sufficient...

Kirkpatrick’s Four Levels of Evaluation(Certification Reading List) state that "without Level 2 (learning) data, poor performance outcomes at Level 3 or 4 could easily be blamed on poor training even if external factors are responsible"​.

Skipping Level 2 leaves no proof of what learning actually occurred.