Measuring leadership effectiveness is not a one-size-fits-all endeavor, but there are some common methods and criteria that can be used. 360-degree feedback is a popular approach, where leaders receive feedback from their managers, peers, direct reports, and sometimes external partners or customers, giving them a comprehensive and balanced view of their performance and behavior. Leadership competencies are the skills, knowledge, and attributes that leaders need to succeed in their roles and contexts, and can be defined by the organization or by external frameworks or standards. Leadership outcomes are the results and impacts that leaders achieve or contribute to, such as business performance, employee engagement, customer satisfaction, innovation, or social responsibility, and can be measured by quantitative or qualitative indicators, such as metrics, surveys, or case studies. Ultimately, there is no single way to measure leadership effectiveness, but these methods and criteria can provide a comprehensive view of a leader's performance.