PERT Study Guide with Practice Questions. PERT is a computer adaptive exam. That means that not all test takers will see the same questions, because the computer will show questions of varying levels of difficulty based on the answers to previous questions.
In 1992, SAP released R/3, which represented a switch from mainframe computing to the client-server model, and from a two-tier to a three-tier architecture, in which presentation, applications and data were housed separately. R/3 was a critical product for SAP that launched the company onto the world stage.
A system architecture or systems architecture is the conceptual model that defines the structure, behavior, and more views of a system.An architecture description is a formal description and representation of a system, organized in a way that supports reasoning about the structures and behaviors of the system. system architecture can comprise system components, the externally visible properties of those components, the relationships (e.g. the behavior) between them.