Hierarchical research refers to a method of organizing and categorizing information or data in a hierarchical structure. This structure typically consists of levels or tiers, with each level containing subcategories or subgroups of information that are more specific or detailed. This approach is commonly used in fields such as information science, data management, and organizational management to manage and analyze complex datasets or systems. By organizing information hierarchically, researchers can better understand the relationships and dependencies between different elements within a larger system, making it easier to analyze and interpret the data.