The paper includes the discussion of the key managerial skills, as shown by the classics of organization sciences and contemporary development processes. There is no doubt that modern and effective manager must improve his skills. As already classics pointed out, the importance of these skills varies depending on the level of management. The role of technical skills is particularly important at the lowest level of management, and conceptual skills at the highest one. However, managers at all levels of management must possess strong interpersonal skills, without which human resources cannot be effectively managed.