To drive transformation in a large organization, leaders must create a cultural movement rather than issuing top-down mandates. This involves creating a bold vision, empowering a community of 'changemakers,' and developing 'artifacts of change' like awards and new metrics to reinforce behaviors.

Culture change often feels abstract and daunting. Reframe it as changing a collective set of beliefs. Just as an individual reframes a personal blocker, a team can consciously align on the shared beliefs needed to achieve its goals. This makes culture change a tangible process of checking and resetting shared assumptions.

Radically changing a large company's culture is a decade-long endeavor. A faster, more effective approach is to identify the organization's existing positive cultural DNA. The UniCredit CEO interviewed over 20,000 employees to find their core values, then built his transformation strategy to amplify those strengths.

Successful culture change doesn't start with an announcement or a new mission statement. It begins when a leader takes a decisive action that is inconsistent with the old culture. These actions organically generate authentic stories that employees share, which in turn shifts the organization's narrative and values.

The CEO of AT&T, a 40-year veteran, argues that an insider who understands the company's DNA can be more effective at evolving its culture than an external disruptor. This challenges the common belief that transformational change requires bringing in a complete outsider.

A company's true culture is not its stated values but how its people behave in high-stakes interactions. How leaders communicate during difficult changes, listen under pressure, and handle dissent is the real manifestation of organizational culture. To change the culture, you must change these conversations.

Changing an entrenched culture is daunting. The best approach is to start small. Identify a group of ambassadors, run a focused pilot project aligned with the desired new culture, learn quickly, and use its success to spread change organically rather than forcing a large-scale overhaul.

Real culture change doesn't happen because an executive reviews a dashboard once a year. It happens when managers practice small, positive behaviors every day. The focus should shift from large-scale measurement to enabling continuous, small-scale action, even if based on imperfect data.

Shifting a culture is conceptually simple, much like losing weight (fewer calories in, more out). The difficulty lies in the execution. It requires a conscious choice every day and every interaction to behave differently, recognizing that growth comes from sustained effort, not a single decision.