It involves working six distinct logical levels of change. These levels were first identified by social scientist Gregory Bateson. I see them as concentric rings. The symptoms are the environment, behavior, and capability rings. The system are the beliefs, identity, and core/culture rings.
Whether you work outside in or inside out, or better yet, both simultaneously. To get the quick “hits” while the deeper work percolates, you absolutely have to make sure the environmental changes support the cultural changes, and vice versa.