- Kirkpatrick's four levels of evaluation begin with reaction and move sequentially through learning, behavior, and finally results.
- The most commonly used level of evaluation is Kirkpatrick's first level: reaction.
- Although the sequential and causal relationship among the four levels is essential to the model, existing research does not establish the truth of these relationships.
- The third and fourth levels are difficult to measure reliably.
- Kirkpatrick's model of the four levels of evaluation, well known in the performance improvement field, has received much criticism.
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