Set your seniors to dedicate one day a week to train your juniors. Let them make topic specific schedules for inhouse training days and have those topics/schedu

Set your seniors to dedicate one day a week to train your juniors. Let them make topic specific schedules for inhouse training days and have those topics/schedules revised/supervised by on of the other seniors. Limit the topics to themes that improve the goals of your company. Challenge both sections of your workforce by watching how the learned stuff is implemented. Do that for a year then re-shuffle personnel and start over. This is only a proposition if you can afford 1 day/week financially. Edit: goes without saying, maybe, but make participation mandatory.