Time cost-control

494 views

Published on

0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total views
494
On SlideShare
0
From Embeds
0
Number of Embeds
2
Actions
Shares
0
Downloads
26
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

Time cost-control

  1. 1. Updating Construction Schedules• Procedure: – Change the duration of all completed activities to zeros. – Identify all activities on which work is currently proceeding as live activities. – Put early start time of live activities equals the update time and their durations equal the remaining duration given by the update report. – Change durations of future activities as given in the update report. – Carry out network analysis in the normal way and prepare a new activity schedule. Spring 2008, Time and Cost Control 1 King Saud University Dr. Khalid Al-Gahtani
  2. 2. ExampleSpring Time and Cost Control 22008, Dr. Khalid Al-Gahtani
  3. 3. Example• The position of the activities at the end of the fifth week is as follows: – Activities B, C, D and E have been completed. – Activity F is ready to start at beginning of week 6. – Remaining duration of activity H is 4 weeks. – Remaining duration of activity I is 3 weeks. – Activity G will not start until end of week 7. – Volume of work in activity L has been increased by 33% approximately. – Activity J has been omitted. – It is decided to shorten activity K by 2 weeks.• Construct the updated schedule indicating the critical path and showing new activities times. Spring 2008, Time and Cost Control 3 King Saud University Dr. Khalid Al-Gahtani
  4. 4. Spring Time and Cost Control 42008, Dr. Khalid Al-Gahtani
  5. 5. Work Breakdown Structure• WBS divides the project into recognizable systems (work packages, WP’s or Bid Packages) that responsible assignable work units, and for which accountability can be expected/assigned. P ro ject W o rk P ackages A ct ivit ies S equenc ingSpring Time and Cost Control 52008, Dr. Khalid Al-Gahtani
  6. 6. Traditional A/E PDS O w ner A /E GC Su b1 Su b2 Su b3 Su b4Spring 2008, Time and Cost Control 6King Saud University Dr. Khalid Al-Gahtani
  7. 7. Professional Construction Management O w ne r A /E CM W P1 W P2 W P3 W P4 W P4 Spring 2008, Time and Cost Control 7 King Saud University Dr. Khalid Al-Gahtani
  8. 8. Developing WPs• Develop WBS – Identify WPs• Draw a WPs Network W P3 W P1 W P4 W P6 W P2 W P5Spring Time and Cost Control 82008, Dr. Khalid Al-Gahtani
  9. 9. Developing WPs• Each WP must have – One Performing Agency (PA) such as Subcontractor – One Responsible Agency (RA) such owner’s Project Engineers• Interconnection between Packages should be district and clear to facilitate coordination W P1 W P2 W P3 Spring Time and Cost Control 9 2008, Dr. Khalid Al-Gahtani
  10. 10. Developing WPs• Bid a WP at the most short time so as to stimulate competition (Keep away uncertainty) W P1 W P2 W P3 W P4Spring Time and Cost Control 102008, Dr. Khalid Al-Gahtani
  11. 11. Cost Coding System• Cost Central level = Lowest level at which functional responsibility for individual WBS element exit. – XXX XXX XXX XXX• An example: – 0534.02220.21.A.00.cf34Spring 2008, Time and Cost Control 11King Saud University Dr. Khalid Al-Gahtani
  12. 12. MASTERFORMAT systemT A B L E 1 M a jo r D ivisio ns in the U nifo rm C o nstructio n Inde x0 C o nd itio ns o f the co ntract 9 F inishes1 G enera l requ ire m e nts 10 S pec ia lt ies2 S ite w o rk 11 E quip m e nt3 C o ncrete 12 Furnishing s4 M aso nry 13 S pec ia l co nstructio n5 M etals 14 C o nve ying syste m6 W o o d and p last ic s 15 M echa nica l7 T herm a l a nd m o isture prevent io n 16 E lectrica l8 D oors and w indo w sSpring Time and Cost Control 122008, Dr. Khalid Al-Gahtani
  13. 13. Cost Coding System• Advantages of coding systems are: – Provide a numbering system to replace verbal descriptions of items. – These codes reduce the length or complexity of the information to be recorded. – aids consistency in definitions and categories between projects and among the various parties involved in a project. – aid in the retrieval of historical records of cost, productivity and duration on particular activities. – electronic data storage and retrieval operations are much more efficient with standard coding systems.Spring 2008, Time and Cost Control 13King Saud University Dr. Khalid Al-Gahtani
  14. 14. Project Cost Control• Budgeted Cost of Work Scheduled (BCWS) is the budgeted amount of cost of the work scheduled to be accomplished in a given time period (including support and allocated overhead).• Budgeted Cost of Work Performed (BCWP) is the budgeted amount of cost for the work completed in a given time period, including support effort and allocated overhead. (This is sometimes referred to as “earned value of work accomplished”.)• Actual Cost of Work Performed (ACWP) is the amount reported as actually expended in completing the particular work accomplished within a given time period.Spring 2008, Time and Cost Control 14King Saud University Dr. Khalid Al-Gahtani
  15. 15. Type of performance BC W P BC W S ACW P Fast & L o wSpring 2008, Time and Cost Control 15King Saud University Dr. Khalid Al-Gahtani BCWS
  16. 16. Type of performance ACW P BC W P BC W S Fast & H ig hSpring 2008, Time and Cost Control 16King Saud University Dr. Khalid Al-Gahtani
  17. 17. Type of operformance Fast & L w BCWS BCW P AC W P S low & LowSpring Time and Cost Control 172008, Dr. Khalid Al-Gahtani
  18. 18. TypeFast & performance of H ig h BCWS AC W P BCWP S low & H ighSpring Time and Cost Control 182008, Dr. Khalid Al-Gahtani
  19. 19. Cost IndexC o st V ariance = B C W P A C W P + ve U nder B udgetC o st V ariance 0 W ithin B udget - ve O ver B udgetC o st P erfo rm ance Index = B C W P /A C W P > 1 U nder B udgetCPI = 1 W ithin B udget < 1 O ver B udget% co st o verrun/u nderrun ACW P BCWP = , BCWPSpring 2008, Time and Cost Control 19King Saud University Dr. Khalid Al-Gahtani
  20. 20. Schedule IndexS chedu le/P erfo rma nc e V aria nce =B C W P -B C W S . +ve A head S cheduleS ch./per. V ariance 0 O n S chedule -ve B ehind S cheduleS chedu le P erfo rma nce Inde x = B C W P / B C W S . >1 A head S cheduleSPI =1 O n S chedule <1 B ehind S cheduleSpring 2008, Time and Cost Control 20King Saud University Dr. Khalid Al-Gahtani
  21. 21. B udgeted C o st A t C o m pletio n (B A C ) Estimatedo fCost/Timenit price = T o tal Q uantities U At Completion P udgeted C e A t t o o pletio n (T A C C Blanned T imo st A CC mm pletio n (B A ) ) = T o tal o f Q uantities ÷ P lanned P ro ductivity uantities U nit price E lanned T imo st A CC mm pletio n (E A C ) P stim ated C e A t t o o pletio n (T A C ) = T oC Wo f oD ate A tal PT Q uantities ÷ P lanned P ro ductivity BAC = BAC = B C W PT oD ate C P I T oD ate E stim ated C o st A t C o m pletio n (E A C )M ore accurate estim ate can be reach ed by using these form ulas: T o D ate VA C W P T im e ariance BAC T oD ateE stim ated=C o st A t Co m p let B A C = C ) io n (E A BB C W PoD ate C W PT C P I T oD ate T oD ate = 1 T im e T oD D ate (B A C - B C W PT o ate ) = V arianceate im T o D ate A CB C W S T oD atee W P T oD T C P I T hisPeriodESpring ated T im eC W CooD ate letandn (EControl ) stim B A t PT m p io Cost T A C Time 21 2008, = 1 T im e Dr. Khalid Al-Gahtani T oD ate
  22. 22. Spring Time and Cost Control 222008, Dr. Khalid Al-Gahtani
  23. 23. Project ExampleSpring 2008, Time and Cost Control 23King Saud University Dr. Khalid Al-Gahtani
  24. 24. Project ExampleSpring Time and Cost Control 242008, Dr. Khalid Al-Gahtani
  25. 25. Project Example E N G IN E E R IN G SU B T ASKS ST AT U S AT E N D O F M O N T H 3 (tho usands o f do llars) T ask Status BCW S BCW P ACW PSystem design C o mp leted $131.0 $131.0 $144.0Subco ntract specs Started 132.0 82.0 84.0M aterial tests C o mp leted 22.0 22.0 22.5Specs review Started 22.0 15.0 15.5D rafting Started 97.0 59.0 59.0Fabricatio n/assembly suppo rt C o mp leted 29.0 29.0 36.0Fabricatio n/assembly pro cess Started 100.0 63.0 67.0T est suppo rt Started 21.0 21.0 21.0E ngineering release and review N ot Started T otal $554.0 $422.0 $449.0Spring 2008, Time and Cost Control 25King Saud University Dr. Khalid Al-Gahtani
  26. 26. Project ExampleFigure 5 -9 S tatus sum m ary o f engineering subtasks in pro gress and estim ate to co m plete. T ask BCWS BCWP ACW P S tatusS ubco ntract specs $132 $82 $84 B e hind sc hedu le and o ver co stS pecs review 22 15 15.5 B e hind sc hedu le and o ver co stD ra fting 97 59 59 B e hind sc hedu le but w ithin co stFa bricat io n/asse m b ly pro cess 100 63 67 B e hind sc hedu le and o ver co stT est suppo rt 21 21 21 O n sc hedu le a nd w it hin co st 449 E stim ated to co m p lete: 765 = $812 K 442S u m m ary: E ng ine ering w o rk is be hind sc hedu le a nd a co st o verrun is o ccurring Spring 2008, Time and Cost Control 26 King Saud University Dr. Khalid Al-Gahtani

×