Kirkpatrick is the go-to for most of learning assessment. It’s old and thin and gives a quick and easy answer, so if you care about justification, not actually improving your interventions – Kirkpatrick is for you.
Obviously, I think there is more that can be done for assessing. However, it’s good to know what people are talking about when they think assessment.
Here’s a 6 minute summary of Kirkpatrick with a bit of Phillips ROI.