Phân tích thiết kế hướng đối tượng - Chương 5.2 (HUST) GV.Phạm Ngọc Nam

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goupee.vn TRƢỜNG ĐẠI HỌC BÁCH KHOA HÀ NỘI goupee.com KHOA ĐIỆN TỬ VIỄN THÔNG PHÂN TÍCH THIẾT KẾ HƢỚNG ĐỐI TƢỢNG CHƢƠNG 4. Thiết kế Bộ môn Điện tử tin học fb.com/goupee.vn04/2007 CuuDuongThanCong.com https://fb.com/tailieudientucntt

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goupee.vn goupee.com Chƣơng 5. Triển khai  5.1. Xây dựng hệ thống  5.2. Cài đặt và vận hành fb.com/goupee.vn October 20 OOD - DEI.FET.HUT 2 CuuDuongThanCong.com https://fb.com/tailieudientucntt

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goupee.vn goupee.com Key Ideas  Transitioning to new systems involves managing change from pre-existing norms and habits.  Change management involves:  Unfreezing -- loosening up peoples’ habits and norms  Moving -- transition from old to new systems  Refreezing -- institutionalize and make efficient the new way of doing things fb.com/goupee.vn October 20 OOD - DEI.FET.HUT 3 CuuDuongThanCong.com https://fb.com/tailieudientucntt

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goupee.vn goupee.com Implementing Change fb.com/goupee.vn October 20 OOD - DEI.FET.HUT 4 CuuDuongThanCong.com https://fb.com/tailieudientucntt

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goupee.vn goupee.com Unfreezing fb.com/goupee.vn CuuDuongThanCong.com https://fb.com/tailieudientucntt

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goupee.vn goupee.com Unfreezing Activities to date facilitate unfreezing Users:  Already know of the new system  Helped in the analysis phase  Helped in the design This probably has already unfreeze current habits and norms fb.com/goupee.vn October 20 OOD - DEI.FET.HUT 6 CuuDuongThanCong.com https://fb.com/tailieudientucntt

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goupee.vn goupee.com Moving – Conversion fb.com/goupee.vn CuuDuongThanCong.com https://fb.com/tailieudientucntt

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goupee.vn goupee.com Migration Planning Helps move people from As-Is system to To-Be system What activities will be performed when and by whom  Technical aspects Installing hardware and software Converting data  Organizational aspects Training users on the system Motivating employees to use the new system to aid in their work fb.com/goupee.vn October 20 OOD - DEI.FET.HUT 8 CuuDuongThanCong.com https://fb.com/tailieudientucntt

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goupee.vn goupee.com Elements of a Migration Plan fb.com/goupee.vn October 20 OOD - DEI.FET.HUT 9 CuuDuongThanCong.com https://fb.com/tailieudientucntt

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goupee.vn goupee.com Conversion Styles  Direct conversion  Cold Turkey, Big Bang, Abrupt Cutover  The new system instantly replaces the old  Upgrading to new version of word processor  Simplest and most straightforward  Most risky  Parallel conversion  Old and new systems used side by side  Old is turned off when new is shown to work  Provides a safety net  Added expense and complexity of running both fb.com/goupee.vn October 20 OOD - DEI.FET.HUT 10 CuuDuongThanCong.com https://fb.com/tailieudientucntt

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goupee.vn goupee.com Conversion Location Which parts of the organization are converted, and when Pilot conversion  A few locations are converted first  Once bugs are worked out, other locations are converted  Provides additional testing before going live  Requires more time  Different parts of the organization are using different versions fb.com/goupee.vn October 20 OOD - DEI.FET.HUT 11 CuuDuongThanCong.com https://fb.com/tailieudientucntt

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goupee.vn goupee.com Conversion Location Phased conversion  Partition the organization  Convert each partition one at a time  Allows smaller installation team  Same pros and cons as pilot conversion Simultaneous conversion  All locations are converted at the same time  Can be used with direct or parallel conversion  Everyone uses same version  Requires large staff to perform conversion fb.com/goupee.vn October 20 OOD - DEI.FET.HUT 12 CuuDuongThanCong.com https://fb.com/tailieudientucntt

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goupee.vn goupee.com Conversion Modules Which part of the new system is installed when Whole system conversion  All modules converted in one step  Most common  May be a steep learning curve for users Modular conversion  Separate modules are converted one at a time  Application must be written for this fb.com/goupee.vn October 20 OOD - DEI.FET.HUT 13 CuuDuongThanCong.com https://fb.com/tailieudientucntt

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goupee.vn goupee.com Conversion Strategies fb.com/goupee.vn October 20 OOD - DEI.FET.HUT 14 CuuDuongThanCong.com https://fb.com/tailieudientucntt

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Key Factors in Selecting a Conversion goupee.vn goupee.com Strategy  Risk  Seriousness of remaining bugs  Parallel less risky than direction conversion Bugs can be fixed before shutting down old system  Pilot less risky than phased or simultaneous  Cost  Parallel requires paying for two systems for a period of time  Simultaneous requires more staff to support all locations fb.com/goupee.vn October 20 OOD - DEI.FET.HUT 15 CuuDuongThanCong.com https://fb.com/tailieudientucntt

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Key Factors in Selecting a Conversion goupee.vn goupee.com Strategy  Time  Direct conversion is fastest  Parallel takes longer Need to wait for the turn off of the old system  Simultaneous is fast All locations done at once  Phased takes longer Need to wait until all modules are installed fb.com/goupee.vn October 20 OOD - DEI.FET.HUT 16 CuuDuongThanCong.com https://fb.com/tailieudientucntt

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goupee.vn goupee.com Characteristics of Conversion Strategies fb.com/goupee.vn October 20 OOD - DEI.FET.HUT 17 CuuDuongThanCong.com https://fb.com/tailieudientucntt

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goupee.vn goupee.com CHANGE MANAGEMENT fb.com/goupee.vn CuuDuongThanCong.com https://fb.com/tailieudientucntt

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goupee.vn goupee.com Change Management Conversion was the technical aspect of moving to the new system Change management is the organizational aspect of moving to the new system fb.com/goupee.vn October 20 OOD - DEI.FET.HUT 19 CuuDuongThanCong.com https://fb.com/tailieudientucntt

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goupee.vn goupee.com Key Players in Change Management The sponsor  The business person who initiated the request for the new system  Usually senior management  Must be visible leader of change  Development team doesn’t have the clout to change minds and hearts fb.com/goupee.vn October 20 OOD - DEI.FET.HUT 20 CuuDuongThanCong.com https://fb.com/tailieudientucntt

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