Training and formal learning of any kind is nowadays seen as something old-fashioned or an necessary evil. Old-fashioned because of course it should be social, through networks rather than hierarchies, extracted from work instead of added to work etc. However, in some businesses we’ve got something called certification requirements. You’re not allowed into the customer’s facility without that badge of certification to do any repairs or whatnot.
This is when we come back to the “necessary evil” side of formal learning. For your employees to be allowed to enter your customer’s facilities they need to be formally certified. This is the Why and the What but it’s not as clear cut regarding the How. I suggest the following: