Question on Baseline

Submitted by vivek_baliga on Tue, 10/16/2012 - 15:05

Historical data maybe lost when you rebaseline the schedule ...


Is the above statement correct ...as per PMBOK guide pag 99 ...


 


"Changes to the baselines should only show the changes from the current time forward . Past perf may not be changed .This protects integrity of the baselines and the historical data of past performance . 


 


 

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sspawar

Wed, 10/17/2012 - 01:38

Cumulative past data will be impacted on rebaselining in any point of time.


Whole S-curve will get change of EV AC PV.


and hence variance SV CV will also change of any past point of record.


This is called updating of palnning.


Regards


 

anand_kl

Wed, 10/17/2012 - 08:23

Dear Pawar,


I think the statement "Historical data may be lost if schedule is re-baseline ..." is False.


Even as you say about EVM parameters, EVM parameters are calculated for each reporting period. So for example, Reporting period one, lets say CPI was 0.9 and our forecast shows that EAC has not changed.


Suppose during reporting period two, if my EAC changes due to re-baseline of project constraints (like decreasing the schedule might have increased cost for resources), I would have to manage the indices based on current change. How would it change the Reporting period one CPI of 0.9. And also for the fact, whether there is re-baseline or not, EVM parameters are subjected to change in each reporting period based on project dynamics.


Request you to please clarfiy this.


Regards,


Anand KL, PMP

sspawar

Thu, 04/04/2013 - 08:30


   

PROGRESS
IN TERMS
OF EV,AC,PV

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

    

 

                                              

 

                                      

 

  

 

                                              

 

                                      

 

  

 

                                              

 

this part will be taken as revised baseline
-Yellow Blocks

 

  

 

                                              

 

 

  

As per P99 after rebaselining this part
will remain as original base line yellow blocks

 

  

 

  
     

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

  
     

 

 

                      

 

 

  

 

  

 

                                              

 

  

 

 

                      

 

 

      

 

  

 

                                              

 

 

                      

 

 

          

 

  

 

                                          

 

 

 

                    

 

 

              

 

  

 

                                      

 

 

    

 

                

 

 

    

Rebaselining

  

 

  

 

              

Original Baseline

   

 

        

 

            

 

 

 

 

 

 

  

 

  

 

                

 

          

 

        

 

 

            

IN THICK
 BLOCK

  

 

  

 

                                

 

            

 

    

 

 

                  

 

  

 

                              

 

                

 

 

                      

 

  

 

                            

 

              

 

 

    

ACTUAL PROGRESS
IN RED BLOCKS

    

 

  

 

                          

 

            

 

 

    

 

 

                

 

  

 

                        

 

          

 

 

      

 

                    

 

  

 

                      

 

        

 

 

 

        

 

                    

 

  

 

                    

 

        

 

  

 

          

 

                    

 

  

 

                  

 

        

 

  

 

            

 

  

PMBOK P99 HENCE
SPECIFIEING TO MAINTAIN THE PREVIOUS STATUS(baseline, past of that revision point of time) AS IT IS and after that point of time new baseline will be followed- yellow blocks

 

  

 

                

 

        

 

  

 

              

 

    

 

              

 

        

 

 

 

                

 

    

 

            

 

      

 

 

 

                    

 

    

 

          

 

    

 

 

 

                        

 

    

 

        

 

    

 

 

                            

 

    

 

      

 

  

 

 

                                

 

    

 

    

 

 

 

                            

a point
of time >

    

 

  

 

 

 

                                  

 

 

 

 

                                    

 

 

 

                                    

 

  

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

  

TIME

  
 
 

 

projmanpro

Sat, 01/19/2013 - 15:54

Hi Vivek,

I dont think if you have understood the posts in reply to your question, i think the more you became complicated :)

Let me answer your question and explain:

Since you refer to PMBOK Guide 4th Edition p.99, the explanation there if you just read and understand it is clear. The PMBOK does not say that statement - 'historical data maybe lost when you re-baseline the schedule... It is probably your own understanding or statement. Hence, i would say, that statement your wrote is not correct.

What PMBOK tells us is that - if we impose changes to the baselines (which means revision to the baseline), should only show the changes from the current time forward.

Let me give you these points.

'Rebaseline' is not an acceptable term in PMBOK and in project management. There is no such thing as 'rebaselining.' The correct term must be 'revision' of the baseline which means, you will change the baseline from the time the need to change or in effect of the approved change requests and forward. This is the ideal thing to do as the PMBOK says, with which I agree.

On the other hand, if you re-baseline your baseline - then this connotes that you will destroy your historical data making that term and even that action not acceptable. Follow me if you want more explanations.

 

sspawar

Wed, 04/03/2013 - 15:03

 http://www.pmstudy.com/guides2.asp

8 Re-baselining Process of changing the schedule baseline. It is done when schedule delays are very severe, and the project schedule has to be completely changed.

sspawar

Thu, 04/04/2013 - 04:11

 it is also pmbok term see p 56(pdf87) of pmbok4

--During project execution, results may require planning updates and re-baselining.