Three • Limited & Limited

In software engineering, this IBM-defined model separates applications into the presentation tier (user interface), application tier (logic), and data tier (database) to improve security and scalability [27].

The number three is often used to categorize information for clarity and efficiency: In software engineering

Several landmark documents and events are defined by the number three, often representing a transition from military to political or civil focus: application tier (logic)

A framework for risk management that defines the roles of management (first/second lines) and internal audit (third line) in achieving organizational goals [23]. currently prioritizing the recovery of immunization

UN Sustainable Development Goal 3 focuses on global health, currently prioritizing the recovery of immunization, mental health services, and maternal care following pandemic-era disruptions [15].

Science and technology frequently utilize "three-tier" structures to manage complexity and ensure stability: