Final answer:
Robert L. Katz identified technical, human, and conceptual as the three critical managerial skills needed for effective management.
Step-by-step explanation:
Robert L. Katz proposed that managers need three critical skills in managing, which are technical, human, and conceptual skills. Technical skills involve understanding and proficiency in a specific kind of activity, particularly one involving methods, processes, procedures, or techniques. Human skills concern the ability to work well with other people both individually and in a group, whereas conceptual skills involve the ability to think and to conceptualize about abstract and complex situations, allowing a manager to see the organization as a whole. Robert L. Katz identified technical, human, and conceptual as the three critical managerial skills needed for effective management.