Sales learning ROI

What are the most effective types of learning for salespeople? Here’s what managers think in terms of return on investment…
(Scores are out of 7:
1 = very poor; 7 = very high.)

Field or on-the-job coaching: 5.6,
Peer learning: 5.3,
Classroom training: 4.5,
Self-directed learning: 4.3,
Online learning courses: 4.2.

Source: via Dr Rodrigo Guesalaga, Cranfield University.