Lead and lag concept

There are three tasks A, B, and C. A has duration fo 5 weeks. B cannot start until A has ended and 1 extra week has been used to assign team memebers. C starts one week after B starts. When does event C end, if B = 6 weeks duration and C = 8 weeks duration? What is the depency between B & C above?

Source: Farndale's PMP

Answer: at th end of ...... weeks; and ....... to .......

Other than just to answer, more analysis are below, comment if anything you feel different/ incorrect.

1. There is 1 week lag between taks A and B; and dependency is start to finish

2. There is also 1 week lag between task B and C; and dependency is start to start.

Alternatively we could also tell there is 5 weeks lead between task B and C; and dependency is finish to start. This alternative won't impact int the project schedule as it is exaclty same but only a different view.

So when you state lead and lag, you must also state dependency between tasks.

Am I right?

San

 1. There is 1 week lag between taks A and B; and dependency is start to finish
1. There is 1 week lag between taks A and B; and dependency is finish to start


rest of the things are okay.
 
Answer: at th end of .15..... weeks; and ..S..... to ..S.....
 

Dear Pawar,


Can you please provide a network diagram for this query. I'm still not clear why the dependency is SS

Sspawar,


You are right 1 week lag between A & B has dependency finish to start, my typo.


Your network diagram is perfect, kudo for you!


This single question with this analysis gives clear concept of lead and lag.


San

 


 

1 START METHOD

   

1


  5

 

7


12

 

A/5


FS+1


> 

B/6

 

 

< 

   

SS+1

 

 
     

8


15

     

> 

C/8

     

 

         
 

O START METHOD

   

0


5

 

6


12

 

A/5


FS+1


> 

B/6

 

 

< 

   

SS+1

 

 
     

7


15

     

> 

C/8

     

 

 Alternatively

 


 

1 START METHOD

       

1


5

 

7


12


8


15

 

A/5


FS+1

 

B/6


FS-5

C/8

 

 


> 


> 

             
             
 

0 START METHOD

       

0


5

 

6


12


7


15

 

A/5


FS+1

 

B/6


FS-5

C/8

 

 


> 


> 

             

 

but in this case contents narrations will change accordingly.