The inputs, tools and techniques, and outputs of this process are summarized in the fol -lowing table.Inputs Tools & Techniques OutputsProject Management Plan Performance Reviews Work Performance InformationProject Schedule Project Management SoftwareSchedule ForecastsWork Performance Data Resource Optimization TechniquesChange RequestsProject Calendars Modeling Techniques Project Management Plan UpdatesSchedule Data Leads and Lags Project Documents UpdatesOrganizational Process AssetsSchedule Compression Organizational Process Assets UpdatesScheduling Tool6.7.1 Control Schedule: InputsThe following are the inputs into the schedule control process: 6.7.1.1 Project Management PlanThe project management plan contains the schedule management plan and the schedule baseline. The schedule management plan describes how the schedule will be managed and controlled. The schedule baseline is used to compare with actual results to deter -mine if a change, corrective action, or preventive action is necessary.6.7.1.2 Project ScheduleThe most recent version of the project schedule with notations to indicate updates, com -pleted activities, and started activities as of the indicated data date.6.7.1.3 Work Performance DataInformation about project progress, such as which activities have started, their progress, and which activities have finished.ISBN 978-1-62620-981-3 © www.free-management-ebooks.com 57Projec T TiMe ManageMenT6.7.1.4 Project CalendarsA schedule model may require more than one project calendar to allow for different work periods for some activities to calculate the schedule forecasts.Inputs to Control Schedule• Project Management Plan• Project Schedule• Work Perfor mance Data• Project Calendars• Schedule Data• Organizational Pr ocess Assets6.7.1.5 Schedule DataThis will be reviewed and updated in the Control Schedule process.6.7.1.6 Organizational Process AssetsThe organizational process assets that influence the Control Schedule process include existing formal and informal schedule control-related policies, procedures, and guide -lines, schedule control tools, and monitoring and reporting methods to be used.6.7.2 Control Schedule: Tools and TechniquesThere are several different tools and techniques that can be used to control the project schedule. 6.7.2.1 Performance ReviewsPerformance reviews measure, compare, and analyze schedule performance such as actual start and finish dates, percent complete, and the remaining duration for work in progress. If earned value management (EVM) is utilized the schedule variance and schedule performance index are used to assess the magnitude of schedule variations. An important part of schedule control is to decide if the schedule variation requires cor -rective action. For example, a major delay on any activity not on the critical path may have little effect on the overall project schedule, while a much shorter delay on a critical or near-critical activity may require immediate action.ISBN 978-1-62620-981-3 © www.free-management-ebooks.com 58Projec T TiMe ManageMenTIf using the critical chain scheduling method, comparing the amount of buffer remaining to the amount of buffer needed to protect the delivery date can help determine schedule status. The difference between the buffer needed and the buffer remaining can deter -mine whether corrective action is appropriate.Schedule performance measurements are used to assess the magnitude of variation to the original schedule baseline. The total float variance is also an essential planning com -ponent to evaluate project time performance. Important aspects of project schedule control include determining the cause and degree of variance relative to the schedule baseline and deciding whether corrective or preven -tive action is required.6.7.2.2 Project Management SoftwareProject management software for scheduling provides the ability to track planned dates versus actual dates, and to forecast the effects of changes to the project schedule.6.7.2.3 Resource Optimization TechniquesThese are used to adjust schedule due to demand (project time) and supply of resources (resource availability). They include resource leveling and resource smoothing, which were described earlier.6.7.2.4 Modelling Techniques
These are used to review various scenarios used in risk monitoring to bring schedule
model in alignment with project management plan and schedule baseline. What-if scenario analysis is used to assess feasibility of the project schedule under adverse conditions. Simulation calculates multiple project durations based on different sets of assumptions.
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