manejando fuera de secuencia en primavera p6.docx

8/11/2019 Manejando Fuera de secuencia en Primavera P6.docx

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HANDLING OUT OF SEQUENCE PROGRESS IN AN UPDATED P6 SCHEDULE

What is Out of Sequence Progress in Primavera P6?Out of Sequence Progress occurs from a deviation in the original planned logic that was set up in the baseline schedule. It can occur when work is executedn the field in a different order than was planned in the schedule. The result can affect your projects logic, which dictate s the order of execution of activities.

Checking for Out of Sequence progressTo check for Out of Sequence Progress in an updated schedule the following steps must be taken.By selecting the F9 key or the Schedule hot key the Schedule dialog box will appear. There is a Log to File function that creates a summary level report from

he current project. The Log to File box must be checked and a location for the file needs to be mapped by selecting the browse button (box with four dots).f a log file has not been run in the current database a Specify Log File dialog box will appear. To create the log select YES in the dialog box if prompted.See graphics below.

Map and name the Log file to the desktop or a specific drive.

Dealing with Out of Sequence Progress in an updated Primavera P6 scheduleA summary report with various sections will be produced, but the focus of this discussion is the output file for Out of Sequence Activities within this report.This portion of the report shows the number of Out of Sequence activities, Project ID, Activity ID and the Activity Description for all Out of Sequenceactivities in the current project. See graphic below.

NOTE: This report should be run every time an update is done (i.e. weekly or monthly).After running and printing the report each out of sequence activityshould be reviewed and corrected (if possible). Depending on the project there can be several different types of Out of Sequence Progress occurring andeach may have a specific solution.

Out of Sequence Progress : Example 1Analysisn the first example, activity 110ERI2131 is an activity in the report above that has out of sequence progress that needs to be addressed. See highlightedactivity above Example 1.To see why the issue is occurring, the original logicmust be understood. In the baseline schedule the original logic was set up as Install Lighting ConduitColumns 7-15 and was to be installed before the Lighting Conduit Columns 15-21 as a Finish-to-Start relationship. See the graphic depicting this baselineogic below.


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After approval of the baseline schedule and the start of updating the project schedules, the projects logic can always change depe nding on what is beingnstalled in the field. In this instance, the logic has changed and the Lighting Conduit Col 15-21 is now actually starting first, but the existing logic (from thebaseline) remains the same and is causing Out of Sequence Progress by pushing out the Lighting Conduit Col 15-21 end date incorrectly. See the graphicbelow.

Correcting the logic

To correct this type of Out of Sequence Progress, the logic must be altered to reflect the correct flow of work. In this case, the Finish-to-Start (FS) tie fromNSTALL LIGHTING CONDUIT Col 7-15 to INSTALL LIGHTING CONDUIT COL 15-21 needs to be broken and re-tied showing the Conduit Col 7-15 asollowing (successor to) the Conduit Col 15-21. See graphics below.

By removing the Lighting Conduit Col 7-15 as a predecessor and making it a successor to Lighting Conduit 15-21 the Out of Sequence Progress has beeneliminated and the logic is now modeling what is taking place in the field. However, in doing this, the Lighting Conduit 15-21 no longer has a Predecessor tieand cannot be left this way. A properly statused activity that logically precedes the Lighting Conduit Col 15-21 will need to be tied as a proper predecessor.Open ends on installation activities are not acceptable.

Out of Sequence Progress : Example 2AnalysisAnother example from the log report would be activity 108ERI4343 (see example 2 above). The original logic (baseline) was a F inish-to-Start (FS) tie from08ERI4343 to 108ERI4344. In the updated schedule this scenario clearly depicts two activities that are being worked concurrently while their original logicemains tied as end-to-end (i.e. Finish-to-Start).

Correcting the logicn this scenario the logic should be changed to reflect the concurrent work (in the field) which would result in the predecessor (to 108ERI4344) tie beingchanged to a Finish-to-Finish (FF), lag 2 days. The lag shows that consideration has been taken to make sure the activities do not finish conveniently on thesame day after changing the logic. See graphic below.

With the logic changed and the Out of Sequence progress resolved, the relationship between the two activities now looks like the graphic below.

Out of Sequence Progress : Example 3Analysis

n the last example the Out of Sequence progress cannot be resolved and must be left in place to show true representation of the

work currently happening in the field. In this example activity 106EMB1010 MobilizeWV (example 3 see above) has started butts predecessor activity 106AMWV2000 has not which is clearly causing Out of Sequence progress. See first graphic below. In thisnstance the owner directed the contractor to perform ductbank work earlier than originally scheduled stating that this work isunrelated to the station work which is scheduled to be performed later which would be preceded by the contractual access activity.


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Retaining the Original Logic

The logic should stay intact to reflect the Out of Sequence work being performed. This Out of Sequence work should be quantifiedand noted in the monthly update narrative that gets transmitted to the general contractor.

ConclusionAs shown in the examples above, most out of sequence progress can be resolved, but where it cannot, or more importantly, wher e it should be retained, itshould be communicated to all parties involved in the schedule clearly.Out of sequence progress can be inevitable due to changing conditions on the project site, but how it is handled during the life cycle of the CPM schedule ishe more important aspect.Reviewing the accuracy of the schedule logic against the sequence of the installation work in the field is the key and the logic should be analyzed duringevery update period. Whenever logic has been revised from the baseline plan it should be noted in a monthly schedule narrative or a letter to theowner/general contractor specifying all logic changes. If schedule logic is continuously revised each update period to reflect the sequence of work in the fielda full schedule review might be warranted to determine if a re-baseline plan is needed.

Comments

MahmoudsaysJune 29, 2013 at 6:16 amgood lesson Sean, but the third example in not clear..Reply

Larry ErbesaysJune 30, 2013 at 3:50 pmCouple of questions, when out of sequence work occures and the work being done out of sequence is 100% complete, therefore no longer affecting itssuccessor, is it still necessary to redo the logic? (In answering this question assume the remaining activity will start on the current data date therefore aogical predecessor is not needed to push the activity out to a specific start date.) Also, more importantly, will not corrected logic for completed activitieshave any effect the remaining critical path activities? (I cant imaging it does but need to be sure.) Reply

Larry ErbesaysJune 30, 2013 at 5:31 pmFollow up question, if the baseline showed an activity(s) as NOT critical how are you to determine (at the time of schedulimg) if, now that it was done out ofsequence, whether or not is became critical and therefore any delay to the out of sequence work is subject to compensatory time? This is especially difficultor me if the out of sequence work is 100% completed between schedule updates.Reply

Sean CainsaysJuly 1, 2013 at 7:28 amMahmoud,Thanks for your comments. Maybe I should have used a different example. Typically, as a contractor, we do not get schedules from the General Contractorand we need to track the key predecessors to our work (work by others that drives our work) in our schedule. In doing that we do not put the completeactivity in but, just the predecessor. So in a case where the work by others is not complete and ultimately holds up our work, we leave the out-of-sequencework in place to show that we still need that predecessor to finish before our work can complete. I hope that is clearer.Larry,To your first question, yes, the out-of-sequence work should be corrected even if one of the activities in question is complete. It is good practice to review allout-of-sequence work each update period to make sure you do not have a very long list (of OOS) as well as not to have any remaining duration pushinghrough complete activity logic. The effect on the critical path will be that you have good forecasted end dates and not any issues of out-of-sequenceworking inadvertently pushing out any work that is not complete. In regards to the second question, you cannot ask for compensation until you have used upall available float (youve gone negative) and this can be quantified by co mparing your current update to the baseline schedule to see if there has been a

delay issue. Out-of-sequence logic does not necessarily cause negative float but, it can use up available float very easily and the more out-of-sequenceogic you have the more issues you will have with incorrect forecast dates and less available float for all the activities tied to the out-of-sequence (inquestion).Reply

GfreddieKsays
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July 7, 2013 at 8:19 amn correcting the logic of the Out of Sequence activities, do you change the scheduling option from Retained Logic to Progress Overide? or you just keep itRetained Logic until the project is done.Reply

Sean Cain saysJuly 8, 2013 at 7:38 am

Freddie,would not advise switching between the Retained Logic or Progress Override setting on any project regardless of the out-of-sequence activities. You needo check what the contract specifies for which option is to be used and that setting should be used for the duration of the project. Most projects will specifyhe use of Retained Logic.Reply

tajamalsaysSeptember 10, 2013 at 9:45 amwhile updating the schedule the predecessor completed before its planned finish date , n this completion have no effect on successor whose start data isbehind the data date .as in my opinion successor should take the data date as the start date bcz the predecessor is completed before the its planned finishdate.plz reply Mr. Sean Cain

Reply

Sean CainsaysSeptember 12, 2013 at 11:12 amTajamal,That would be assuming the logic tie is a SS relationship. With the predecessor activity NOT complete, it will still drive the successor properly which isshown above in the example.Reply

Sean Cainsays

September 16, 2013 at 3:10 pmAnother thing to remember is that even though a predecessor is complete, ITS predecessor may not and can continue to push through to follow-onsuccessors.Reply

Kishore A Nair saysJune 22, 2014 at 1:16 am* In this case that is, while fixing out of sequence activities, I think we are loosing a baseline to compare. Because if we change the link in the update thenhe sequence in the baseline and the update will have a different flow . So we cannot compare the baseline dates and logic with the updates thereafter.So on which program we will prepare the EOT.Based on which program dates we can send delay notices?Reply

Sean Cain saysJune 23, 2014 at 10:20 amKishore,The Update tracks the progress of a project and is supposed to adapt and change to what is going on with said project, whereas the baseline staysuntouched. You must certainly fix any out-of-sequence progress encountered with the project because the update is not always going to track what thebaseline laid out. This is very common in most forms of construction and is expected to be implemented where necessary. Remember, the baseline is theoriginal plan for the project and it is a best case scenario for the buildout of the the project. The update is as built status, current forecast and future forecasthat changes with the project.Any delay notices should be based off the update, although you can also show delays in a copy of the baseline for some forms of delay analysis.Reply

Kishore A Nair saysJune 28, 2014 at 4:10 amThanks Sean,What you said is correct and logical. But generally I think we required prior consent from client for this kind of scheduling.Also could you please suggest me some references about this practice. So that I could convince my people over here about this practice.Thank you so much and Will be watching the blog closely for these kind of informative tips.Reply
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