Task activities and hammock activities

Submitted by Marcio Sampaio on
Primavera Project Planner - P3

Member for

20 years
Member for 20 years
Submitted by Marcio Sampaio on Mon, 2006-07-24 20:50
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Hello all.



Read this other response.



From Primavera:



Define a task activity. P3 schedules a task activity according to

the base calendar assigned to the activity. Designate an

activity as a task activity if you aren’t assigning resources to the

activity, or if the assigned resources should be scheduled

according to the activity’s base calendar; rather than each resource

calendar.

For example, several activities must be done in the week before a new

radio station begins broadcasting. It doesn’t matter

whether the resources are available earlier than that week, or

whether they will otherwise be scheduled for time off during

that week--these activities must be scheduled during a specific

timeperiod, and their scheduling controls the scheduling of

their resources.



Define a hammock activity. Use hammocks to monitor the elapsed

beginning-to-end duration of a group of activities. A

hammock duration is the number of days between the beginning of the

first activity and the end of the last one in the

group--not the sum of the activities’ durations. If several hammocked

activities overlap, the hammock’s duration will be smaller

than the combined durations; if large gaps exist between the

activities in the hammock, its duration may be longer.



To set up a hammock activity



1 Display the Predecessors form for the hammock activity.

Define the hammock’s predecessors. Specify a start to start

relationship and zero lag for all predecessors to the hammock.

2 Display the Successors form for the hammock activity. Specify

a finish to finish relationship and zero lag for all

successors to the hammock.

3 After you establish the beginning and ending points of the

hammock, calculate the schedule.



Regards.



Marcio Eduardo

Rio de Janeiro - Brazil

Member for

19 years 4 months
Member for 19 years 4 months
Submitted by Paul Naughton on Tue, 2006-07-18 05:43
Permalink

Or, to keep it simple.



A hammock summarises task activities (using the criteria provided by Praves)

Member for

19 years 5 months
Member for 19 years 6 months
Submitted by Praves Suppa on Mon, 2006-07-17 23:17
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Hello,



I found one article explained clearly for Hammock



1. P3 calculates the duration of a hammock activity and graphically presents it on the layout

based on the early dates only.

2. For a hammock activity with no progress, P3 calculates a hammock’s duration by the

difference from the earliest early start date of the its predecessor activities to the latest early

finish date of its successor activities. Therefore it has no fixed duration. P3 calculates the

original and remaining durations automatically based on the following formula:

a. Original Duration = (Early Finish Date – Early Start Date)

b. Remaining Duration = Original Duration

3. A hammock should have at least one predecessor and one successor. A hammock without

predecessor starts on the data date, and that a hammock without successor ends on the

project completion date.

4. For a hammock activity in progress, a hammock activity bar starts on the actual date, and

P3 calculates the original and remaining durations, and percent complete automatically

based on the following formula:

a. Remaining Duration = (Early Finish Date – Data Date)

b. Original Duration = (Data Date – Actual Start) + Remaining Duration

c. Percent Complete = (Original Duration – Remaining Duration) / Original Duration

5. A hammock activity can’t drive (push out) any task activities. I often call its behavior like a

“Rubber Band” as it is stretched or compressed according to its successor and predecessor,

not the other way around.

6. If you unlink the remaining duration and schedule percent complete in the Autocost Rules

window, you can manually enter the percent complete for a hammock activity. However,

you absolutely can’t manually enter the original and remaining durations. P3 will overwrite

your inputs.

7. An asterisk mark (*) will always be shown right next to the original and remaining durations

of a hammock activity to denote that the durations are automatically calculated by P3.