I think most of the teams adopt it’s main activities without strictly following the rules. This way, it’s easy to start using, but teams never truly master it a

I think most of the teams adopt it’s main activities without strictly following the rules. This way, it’s easy to start using, but teams never truly master it and usually start inventing their own heuristics for planning/reviews. Some large companies, actually invest their time in agile training and contribute to SE process research. From large companies, I can call Ericsson and Spotify (good scrum at scale examples).