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It is so important to select the suitable materials from the 100.000 materials used in industry, but this is not an easy process. A technical person (an engineer or technologist) cannot select the suitable materials for an application area without having the sufficient knowledge about the structure and properties of materials. Errors can reach to enormous extents; this situation makes difficult for the selector of materials and other related units. In this article, first the importance of the selection of materials is mentioned and then fundamentals of materials' selection are explained. The steps for selection of materials are studied and the required factors paying to attention in materials selection are investigated. [ABSTRACT FROM AUTHOR]

The article presents information on system concepts that assists one in designing more innovative software systems. By using system concepts one can simplify the way one determine, handle, and communicate the requirements during software development. The system concept both binds the problem, requirements, and possible solutions and functions. If one don't have time for comprehensive requirements work, try to figure out the system concept. Creating something simple and tangible to help you understand and communicate what your project is all about is often the shortcut that you need. This should be a skill in an requirements engineer's repertoire. The concise description synthesizes the problem's essence, requirements, projected solution, cost and return on investment. System concepts may provide an analogy or metaphor to capture the idea. System concept acts as a project's gist. System concept is a stating point to engineers in many fields. Thus, searching for system concept may be integral to any software development project.