All that can be done is to explain things very clearly, with examples, offer to help, etc... so they have every opportunity to get it right / improve. The rest

All that can be done is to explain things very clearly, with examples, offer to help, etc... so they have every opportunity to get it right / improve. The rest is up to them. Don't make it personal / use generalizations ("you always", "you never"...) like "It's very hard to explain you concepts, you should work on conceptualization"... just explain the thing clearly, with point to an example/documentation, mention the steps involved and timeframe expectation, tell them they can ask questions for anything that's not clear. Then, they'll either take it on board, or they wont. As you allude to, some people are just not motivated, checked out... maybe they have a side project or personal problems or whatever. You can't make anyone motivated, all you can do is provide clear information and stay professional. If you're an employee, accept that you don't own the organization, choose coworkers or define the product direction, so you kind of have to get along with things that you'd do differently if it were all up to you.