Tier structure
Tier refers to a series of rows or layers or a level or grade in the hierarchy of an organization or system. A tier structure describes a system with distinct levels or layers. In the arrangement of a tier system, one level must be completed or accomplished before another commences. Each level must be undertaken separately from the other [The Business Professor].
Organizational structures are hierarchies of command. There are two major types: tall and flat. The main difference between tall and flat organizations is how information flows through the enterprise. The three-tier structure is classified as a flat hierarchy. Modern organizational theory favors the flat structure because the free, two-way information flow it embodies encourages innovation -- an important enterprise trait in the rapidly changing technology industry and in the industries that adopt technology to foster more rapid growth [CHRON].
What is a Tier Structure?. The Business Professor. Retrieved from: https://thebusinessprofessor.com/en_US/mgmt-operations/tier-structure-definition
Explain the Three-Tier Organizational Structure. CHRON. Retrieved from: https://smallbusiness.chron.com/explain-threetier-organizational-structure-58320.htm