Wat is the difference between wbs summary and level of effort
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Wat is the use of both type of activities and where do we use them?
Basicly WBS summary activity dates are calculated from earliest start and latest finish in the group, for LOE you need a predecessor and successor.For details please refer to primavera help/activity types which i pasted below.
WBS summary activity
Use a WBS summary activity to summarize a WBS level. The WBS summary activity comprises a group of activities that share a common WBS level. For example, all activities whose WBS codes start with A (A.1, A.1.1, A.1.1.2, A.2, A.3 and so forth) can be part of one WBS activity whose WBS code is A. At a lower level, all activities whose WBS codes start with A.1 (A.1, A.1.1, A.1.1.2 and so forth) can be part of a WBS activity whose WBS code is A.1.
The dates calculated on a WBS summary activity are based on the earliest start date of the activities in the group and the latest finish date of these activities. The WBS summary activity duration is calculated based on its assigned calendar.
Note
You cannot assign constraints to WBS summary activities.
Level of effort activity
A level of effort activity’s duration is dependent on its predecessor and/or successor activities. Level of effort activities cannot have constraints assigned to them. Level of effort activities are not included when leveling resources.
Use level of effort activities for on-going tasks that depend on other activities. For example, you could assign level of effort activities for clerical work, a security guard, or even some aspects of project management.
A level of effort activity is similar to but different from a hammock activity.
A level of effort activity uses its assigned calendar to summarize its dates. Hammocks are not scheduled using their own calendar.
Any type of relationship can be assigned to a level of effort activity. Only a start-to-start and finish-to-finish relationship can be assigned to a hammock activity.
A level of effort activity's duration is calculated from the earliest early start of its predecessors/successors (linked to the start end of the level of effort activity) to the latest early finish of its predecessors/successors (linked to the finish end of the level of effort activity).
A hammock activity’s duration is calculated from the earliest early start of its predecessors to the latest early finish of its successor activities.