Imagine your organisation is replacing a customer service system. The organisation chart names the teams and their reporting lines. It does not show who waits on whom.
Operations relies on a data team. That team depends on a supplier. An AI agent also uses the service. Their records sit in different places, and each describes only part of the picture.
Before changing anything, you need to see those relationships and who answers for them. This example is fictional, and it runs through the rest of the page.