Final answer:
According to Robert Katz, human skills maintain a relatively consistent degree of importance across all management levels due to their essential nature in enabling effective collaboration and leadership.
Step-by-step explanation:
According to Robert Katz, the degree of importance associated with human skills remains relatively consistent across all levels of management. Human skills pertain to the ability to work well with other people, both individually and in a group. Given the nature of managerial roles that involve coordination, conflict resolution, and leadership, human skills are essential at every level - from first-line supervisors to top executives.