If activities are linked through more than one In the next section, we are sharing an example of these Read on for a definition and illustration ofĮach of these types. You can memorize the concept as follows: The first part (‘finish’ in ‘finish-to-start’, for instance) refers to the status the predecessor activity must obtain for the successor activity to achieve the status expressed in the second part (‘start’ in FS). Of logical relationships in the precedence diagraming method are: This is similar to the activity-on-node orĪctivity-on arrow method yet more flexible as it allows overlaps of activities These dependencies form theĬonnection between successor activities and predecessor activities which are – that are introduced in the next section. The identification and visualization of the sequence and dependencies ofĪctivities in a project or a part of a project, such as a workstream or a work package.Ĭan reflect 4 types of dependencies – also referred to as logical relationships The precedence diagramming method can be used for creating a project schedule network diagram which is an output of this process that is used as an input for the ‘develop schedule’ process ( PMBOK, ch. Starting dates can be assigned to each activity by doing a forward pass proceeding from left to right in the network diagram beginning with the project start date.PDM is a scheduling technique of the ‘sequence activities’ process in PMI methodology. The dates derived by this method are the early start (ES) dates. The early start date for an activity is the earliest date the activity can begin. The estimate considers durations and resource availability calendars. Assign the calculated date as the early start date of the successor activity.Refer to the resource calendar (or calendars) that applies to the people and equipment necessary for the activity, and add the number of off-days that the activity would span on those calendars.Add the lag time or subtract the lead time.Īdd the predecessor activity’s duration to its start date.įollow these steps to calculate the early start dates of subsequent activities, assuming finish-start relationships: To calculate early start dates, begin with the project start date and assign that date as the start date of activities that have no predecessor activities. The next step is to work through the network diagram from right to left beginning with the mandated completion date, which is a milestone that is set in the project plan. Subtract the duration of each activity in each path to determine the latest date the activity could begin and still meet the project completion date. ![]() Resource calendars must be considered in the backward pass as well as the forward pass. Assign the calculated date as the late start date of the predecessor activity.Refer to the resource calendar (or calendars) that applies to the people and equipment necessary for the activity, and subtract the number of off days that the activity would span on those calendars.Subtract the lag time or add the lead time to the late finish date.Subtract the predecessor activity’s duration from its late finish date.Follow these steps to calculate the late start dates of predecessor activities, assuming finish-start relationships: To calculate late start dates, begin with the project completion milestone and assign that date as the finish date of its predecessor activities. The difference between the early start date and the late start date for activities on the critical path is usually the same as the total float, unless the activities are affected by the resource calendars differently in the forward and backward pass. What is the difference between free float and project float?.If the last activity in the critical path has a completion date that is five days later than the project completion date, the project has a _ _ (two words) of five days.If two sequential activities overlap and the successor activity can begin three days before the predecessor begins, those three days are called _ time.The difference between the sum of the activity durations along the critical path and the project completion date is the project _.The path through the network diagram that has the longest total duration is the _ path.For example, if a piece of key equipment is only available for a few days, activities that depend on it have the same start and finish dates in the forward and backward passes.
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