tailieunhanh - The CISSP Prep Guide, Second Edition Mastering the CISSP and ISSEP Exams phần 10

Trong việc lựa chọn một mô hình máy tính, người ta phải đảm bảo rằng công cụ được chọn những gì được mong đợi, là nhạy cảm với vấn đề ở bàn tay, và cho phép xây dựng xong VISI cần thiết trong việc giải quyết các hệ thống như một thực thể, cũng như bất kỳ com ponents lớn của nó trên cơ sở cá nhân-by-cá nhân. | 920 Part III Appendices Select a Computer-Based Model to Facilitate the Analysis Process In the selection of a computer-based model one must ensure that the tool selected does what is expected is sensitive to the problem at hand and allows for the visibility needed in addressing the system as an entity as well as any of its major components on an individual-by-individual basis. The model must enable the comparison of many different alternatives and aid in selecting the best among them rapidly and efficiently. The model must be comprehensive allowing for the integration of many different parameters flexible in structure enabling the analyst to look at the system as a whole or any part of the system reliable in terms of repeatability of results and user-friendly. So often one selects a computer model based on the material in the advertising brochure alone purchases the necessary equipment and software uses the model to manipulate data and believes in the output results without having any idea as to how the model was put together the internal analytical relationships established whether it is sensitive to the variation of input parameters in terms of output results and so on. The results of a recent survey indicate that there are more than 350 computer-based tools available in the commercial marketplace and intended for use in accomplishing different levels of analysis. Each was developed on a relatively independent or isolated basis in terms of selected platform language used input data needs and interface requirements. In general the models do not talk to each other are not user-friendly and are too complex for use in early system design and development. When using a model it is essential that the analyst become thoroughly familiar with the tool know how it was put together and understand what it can do. For the purposes of accomplishing a life-cycle cost analysis it may be appropriate to select a group of models combined as illustrated in Figure E-9 and integrated

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