Plot__________ curves on the same graph to reveal any trends toward improving or deteriorating cost performance. 2-In order to establish a basis from which to calculate a schedule using the estimated durations for the activities, it is necessary to say who has responsibility for the first task. enter the tasks into a project management information system. select an estimated start time and a required completion time for the overall project. edit the calendars for the resources in the project management information system. 3-With respect to the project schedule, changes can result in any of the following except the addition or deletion of activities. the initial planning and sequencing of activities. changes to estimated durations for specific activities. a new required completion time for the project.