QA Outsourcing: Designing Software Architecture
Typically, each task can be divided into distinct subtasks which in turn also can be broken down into smaller elements, etc. Such partition, known as decomposition, is performed as many times as necessary so that to determine separate elements that can be implemented as separate software modules or procedures.
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As usual, complex software products have all the characteristics of a system that is a set of interrelated full-featured programs. Such programs are often referred to as processes, especially if they proceed in parallel. (Do not confuse this concept with the same term – Windows) Although the processes can be operated independently, as a rule, they interact with each other. For instance, they can use the same data, or one of them may perform certain tasks requested by the other.
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Document that specifies the principles and rules of interaction between the system processes is called a protocol. The descriptive material on software system architecture contains information about its basic components and communication protocols used for their interaction.
Like any other program, certain processes (a process is nothing else but software) lend themselves to partitioning (decomposition). The division of a program into modules is a process called a modular decomposition. In this case, the module means a piece of the source code which can be regarded as an independent unit, with a single entry point. In a glossary for computer programming, this term corresponds to procedures and functions. Actually, a module implements a specific task or a group of well-defined tasks that can be requested by other modules. The requesting module sends the requested module some data for handling, and the latter, in turn, sends back the results.
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