Development is most sustainable and effective when it is appropriately inclusive, comprehensive and balanced. Key developmental areas include awareness of actions, emotions, relationships, "deepest concerns," and how we make moral decisions. Because we express who we are through these areas, and because development in one affects the others, we engage the complete person and group in our work.
We don't do this indiscriminately, hoping to cover all bases, but intentionally, toward the goal of addressing everything that is relevant to attaining your desired outcomes – both strengths that can be leveraged and "stretch points" that call for development.
You know this already: the health of any individual, team or organization hinges on the interplay of individual mindset and behavior, group culture, and systems. Change in any one of these impacts the others. Ignoring any one of these at best leads to partial solutions.