Step 2 identify and negotiate external dependencies

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Unformatted text preview: me when the last activity can be completed becomes the end point for that schedule. Then there is a "backward pass", where the latest possible start point of each activity is calculated, assuming that the last activity ends at the end point previously calculated. Float is the time difference between the earliest start time and the latest start time of an activity. Whenever this is zero, that activity is on a critical Path. WBS element that will require 10 work-years per year. Typically, there is more schedule detail for the current year, and much less detail for subsequent years. Each year, schedules are updated with additional detail for the current year. This first step is most easily accomplished by: • • • Ensuring that the cost account WBS is extended downward to describe all significant products!, including documents, reports, hardware and software items For each product, listing the steps required for its generation and drawing the process as a work flow diagram Indicating the dependencies among the products, and any integration and verification steps within the work package. Step 2: Identify and negotiate external dependencies. External dependencies are any receivables from outside of the cost account, and any deliverables that go outside of the cost account. Informal negotiations should NASA Systems Engineering Handbook Management Issues in Systems Engineering occur to ensure that there is agreement with respect to the content, format, and labeling of products that move across cost account boundaries. This step is designed to ensure that lower level schedules can be integrated. Step 3: Estimate durations of all activities. Assumptions behind these estimates (workforce, availability of facilities, etc.) should be written down for future reference. Step 4: Enter the schedule data for the WBS element into a suitable computer program to obtain a network schedule and an estimate of the critical path for that element. (There are many commercially available software packages for this function.) This step enables the cognizant engineer, team leader, and/or system engineer to review the schedule logic. It is not unusual at this point for some iteration of steps 1 to 4 to be required i...
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