Tabular Format (Precedence Diagram)

• Can be carried out on the tabular form without reference to the diagram.

• Advantage: the time required to construct the diagram is eliminated.

• Determination of early start and finish date.

• Start by time zero and add duration to get EF for A, B, C, D.

• For E choose the maximum EFD of B or C.

Determining log

log 5-10 = ESD 10 - EFD 5 = 4 - f 4 = 0

log 15-25 = ESD 25 - EFD 15 = 12 - 7 = 5

log 20-25 = ESD 25 - EFD 20 = 12 - 6 = 6

Determining the Free-Float

• Free Float is the minimum of the log of the link that follow an activity.

• Look at the “Pre. column” to find the same number value of EF for terminal activity “not following act.”

FF 35 = LFD 35 - EFD 35 = 20 - 20 = 0

Determining the Total Float “Backward”

• Take TF of the terminal activity = 0

or TF 35 = LFD 35 - EFD 35 = 20 - 20 = 0

TF I = Min (log ij + TF j )

TF 30 = Min (log 30-35 + TF 35 ) =

Min ( 7 + 0 ) = 7

No other link

TF 20 = Min log 20-25 + TF 25 = Min 6+0 = 6

log 20-30 + TF 30 1+7 { } { }

INTF Float

INTF = TF - FF

INDF

• If the free float is zero - no INDF

INDF j = FF j - Max _ I ( TF I - log IJ )

INDF 20 = FF 20 - Max ( TF 5 - log 5-20 )

= 1- (0 -0 )=1

INDF 30 = FF 30 - Max TF 15 - log 15-30

TF 20 - log 20-30 = 7 - 5 - 0 = 2 6 - 1

{ }