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The impact of shift work on nurses' daily professional behaviour and adverse health outcomes related to shift work should be well understood and considered when organizing healthcare systems. We need to identify ways to support nurses who work nights and also give attention to the caregiver's needs.

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Genetic algorithms (GAs) are computational techniques based upon evolution. They have been recently introduced in architecture to study present complexities in form and function. Despite growing trends and inclinations to use GAs, there is not an organized study and instruction about its usage in architecture. This library research, while examining the structure of GAs, seeks answers to these questions: 1.What is the necessity of GAs in architecture today? 2.Are GAs used to meet special needs of architecture or are they merely complex forms? 3.Haw can GAs come to our assistance in design? And last but not least 4. Does GAs serve reality or unreal abstract forms of an imaginative world!? To answer these questions, the present research studies GAs in architecture and other disciplines. It also investigates their functions in architecture and finally explains introductory parametric operations in this field. Keywords: Genetic Algorithm, Genetic Operators, Parametric Architecture, Optimization INTRODUCTIONSince the 1990s, there was a change in approach leading architects, so that, evolutionary biology technologies have been used to investigate or to depict the complexities of modern architecture. Since the amount of information and level of complexity in most construction projects, are larger than the ability of designers to understand and predict them in a way that traditional methods of design, we can not solve, this complexity at the right time in the midst other evolutionary and dynamic techniques, genetic algorithms, have been used, as a means of optimizing the architecture.