This report provides an in-depth analysis of organizational behavior, focusing on the Landmark Group as a case study. It examines various organizational structures, including flat, divisional, matrix, and functional structures, and how the Landmark Group utilizes a divisional structure. The report delves into the impact of organizational culture, analyzing it through Charles Handy's model, including power, team, person, and role cultures. Furthermore, it explores the impact of learning and development on employee effectiveness, highlighting benefits such as increased productivity, reduced supervision, fewer errors, job satisfaction, and reduced turnover. The report also discusses the importance of teamwork and how it can improve employee effectiveness through workload sharing, brainstorming, co-worker support, moral boosting, and new perspectives. Finally, the report analyzes different leadership behavior theories, including authoritarian, participative, and laissez-faire leadership styles, and their application within the Landmark Group. The report emphasizes how these leadership styles influence employee motivation, guidance, and overall performance within the organization.