Various methods can be used to measure the success of your frontline leadership training program. Consider using surveys or feedback forms to gather participants' opinions on the training's effectiveness. Additionally, track the performance and progression of your frontline employees over time to gauge the training's significant impact on their leadership capabilities. Another effective way to measure success is to conduct 360-degree evaluations, in which feedback is collected from the leaders themselves, their peers, direct reports, and supervisors. This comprehensive approach provides a holistic view of the leader's development and can highlight areas for further improvement.