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    <p>See <a href="http://en.wikipedia.org/wiki/Software_architecture" rel="nofollow noreferrer">architecture</a> and <a href="http://en.wikipedia.org/wiki/Software_design" rel="nofollow noreferrer">design</a>.</p> <blockquote> <p>The software architecture of a program or computing system is the structure or structures of the system, which comprise software components, the externally visible properties of those components, and the relationships between them. [...] Documenting software architecture facilitates communication between stakeholders, documents early decisions about high-level design, and allows reuse of design components and patterns between projects.</p> </blockquote> <p>--</p> <blockquote> <p>Software design is a process of problem-solving and planning for a software solution. After the purpose and specifications of software are determined, software developers will design or employ designers to develop a plan for a solution. It includes low-level component and algorithm implementation issues as well as the architectural view.</p> </blockquote> <p>--</p> <p>So they share parts with each other, but they refer to slightly different aspects of software. Technically speaking, architecture should include <a href="http://en.wikipedia.org/wiki/4%2B1" rel="nofollow noreferrer">all aspects</a>, but in reality they usually refer to high level topology or structure of software. For example, making decision about whether to implement a system as a file-based command line software, a web app, or an <a href="https://stackoverflow.com/questions/312187/what-is-n-tier-architecture/312197">n-tier</a> rich internet application would be an architectural decision.</p> <p>Software design includes making architectural decisions, but it would include much deeper ones like how many characters <code>address1</code> should be in a database, which is not really an architectural decision.</p> <p><strong>Edit</strong>: To simplify the difference, architecture refers to known patterns of software solution, often involving placement and relationships between subcomponents/tiers/layers. The patterns also specify how and where the data is stored, processed, and presented. An architecture is something that could be described using boxes and arrows, such as <a href="http://en.wikipedia.org/wiki/Robotic_paradigms" rel="nofollow noreferrer">autonomous robotic paradigms</a>.</p> <p>The software design is a process of thinking about solutions to the given software requirements. Each problem is unique in its own ways, so design would be different.</p>
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