【正文】 2023年 2月 13日星期一 4時 6分 3秒 04:06:0313 February 2023 1一個人即使已登上頂峰，也仍要自強不息。 2023年 2月 13日星期一 上午 4時 6分 3秒 04:06: 1最具挑戰(zhàn)性的挑戰(zhàn)莫過于提升自我。勝人者有力，自勝者強。 :06:0304:06Feb2313Feb23 1越是無能的人，越喜歡挑剔別人的錯兒。 , February 13, 2023 閱讀一切好書如同和過去最杰出的人談話。 2023年 2月 13日星期一 4時 6分 3秒 04:06:0313 February 2023 1空山新雨后，天氣晚來秋。 2023年 2月 13日星期一 上午 4時 6分 3秒 04:06: 1楚塞三湘接，荊門九派通。 04:06:0304:06:0304:06Monday, February 13, 2023 1不知香積寺，數(shù)里入云峰。 04:06:0304:06:0304:062/13/2023 4:06:03 AM 1成功就是日復一日那一點點小小努力的積累。 上午 4時 6分 3秒 上午 4時 6分 04:06: 沒有失敗，只有暫時停止成功！。 2023年 2月 上午 4時 6分 :06February 13, 2023 1行動出成果，工作出財富。 :06:0304:06:03February 13, 2023 1他鄉(xiāng)生白發(fā)，舊國見青山。 :06:0304:06Feb2313Feb23 1故人江海別，幾度隔山川。 , February 13, 2023 雨中黃葉樹，燈下白頭人。 some activities may fail, changing the nature of the activities that follow 168。 looping back to previous activities is not permitted 168。 PERT 168。 probabilistic 168。 each activity has a probability of occurrence 168。 the nodes (events) are circles and the activities are arrows 168。 PERT 168。 Subjective time estimates 168。 Specified precedence relationships 168。 Useful in monitoring not only schedules, but costs as well Transparency Masters to acpany Operations Management, 5E (Heizer Render) 1652 ?1998 by Prentice Hall, Inc. A Simon Schuster Company Upper Saddle River, . 07458 168。 Networks generated provide valuable project documentation and graphically point out who is responsible for various project activities 168。 Provides project documentation 168。 Uses graphical displays 168。 Useful at many stages of project management 168。 Project variance (V) 168。 Expected project time (T) 168。 LS is latest start 168。 EF is earliest finish 168。 LF = Maximum EF for ending activities 168。 ES = Maximum EF of all predecessors for nonstarting activities Earliest Start and Finish Steps Transparency Masters to acpany Operations Management, 5E (Heizer Render) 1642 ?1998 by Prentice Hall, Inc. A Simon Schuster Company Upper Saddle River, . 07458 168。 EF = ES + Activity time 168。 ES = 0 for starting activities 168。 Activities have 0 slack Critical Path Analysis Transparency Masters to acpany Operations Management, 5E (Heizer Render) 1641 ?1998 by Prentice Hall, Inc. A Simon Schuster Company Upper Saddle River, . 07458 168。 Shortest time project can be pleted 168。 Identifies critical path 168。 Earliest (EF) latest (LF) finish 168。 Provides activity information 168。 Expected time: t = (a + 4m + b)/6 168。 Pessimistic time (b) 168。 Optimistic times (a) 168。 Consume no time or resources Dummy Activities Transparency Masters to acpany Operations Management, 5E (Heizer Render) 1638 ?1998 by Prentice Hall, Inc. A Simon Schuster Company Upper Saddle River, . 07458 1 4 3 12 23 Incorrect 1 4 2 3 5 2 23 34 12 23 24 45 34: Dummy activity Correct Dummy Activity Example Transparency Masters to acpany Operations Management, 5E (Heizer Render) 1639 ?1998 by Prentice Hall, Inc. A Simon Schuster Company Upper Saddle River, . 07458 168。 Otherwise, puter programs get confused 168。 Example: Activity 23 168。 If the project must be finished in less than the scheduled amount of time, what is the way to acplish this at least cost? Transparency Masters to acpany Operations Management, 5E (Heizer Render) 1632 ?1998 by Prentice Hall, Inc. A Simon Schuster Company Upper Saddle River, . 07458 The Six Steps Common to PERT CPM 1 Define the project and all of its significant activities or tasks 2 Develop relationships among the activities. (Decide which activities must precede and which must follow others.) 3 Draw the work connecting all of the activities 4 Assign time and cost estimates to each activity 5 Compute the longest time path through the work. This is called the critical path 6 Use the work to help plan, schedule, monitor, and control the project Transparency Masters to acpany Operations Management, 5E (Heizer Render) 1633 ?1998 by Prentice Hall, Inc. A Simon Schuster Company Upper Saddle River, . 07458 2 4 Years Activity (Arrow) Register Receive diploma Project: Obtain a college degree (.) Event (Node) Attend class, study etc. 1 Event (Node) Network Terms Transparency Masters to acpany Operations Management, 5E (Heizer Render) 1634 ?1998 by Prentice Hall, Inc. A Simon Schuster Company Upper Saddle River, . 07458 1 A B A B can occur concurrently 2 3 Activity Relationships Transparency Masters to acpany Operations Management, 5E (Heizer Render) 1635 ?1998 by Prentice Hall, Inc. A Simon Schuster Company Upper Saddle River, . 07458 1 4 2 3 A B C A must be done before C D can begin D Activity Relationships Transparency Masters to acpany Oper