Design problem statements 794 Subject

In such subjective statements, detailed information was obtained about the nature of the design problems, the handling of tools (CAD, AI systems, conventional aids, etc.), and the environmental conditions (time pressure, disturbances, etc.). Beeause the design task was already finished, no time pressure exists to investigate all aspects of the stress situation. Because the situation was documented on video in different views (overall situation, CAD screen, desk views), the memory of the subject is maximally aided. 

This book teaches both principles and design. Principles are enunciated in the simplest way possible. Equations presented are first derived, except those that are obtained empirically. Statements such as It can be shown... are not used in this book. These authors believe in imparting the principles and concepts of the subject matter, which may not be done by using it-can-be-shown statements. At the end of each chapter, where appropriate, are numerous problems that can be worked out by the students and assigned as homework by the instructor. 

This is analogous to the problem of structural safety. If a structure is a one-off design, there is no repeatable experiment which can be set up to test the statement the probability that the structure will fail in the collapse limit state of plastic mechanism X is low . It can only be done through tests and assessments made on structures and components of structures which are not precisely the same as the structure in question but the degree of similarity has to be assessed subjectively. 

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