MATERI 8 - Universitas · MATERI 8 * * * * * * * * * * * The time for each activity is assumed to...
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MATERI 8
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*The time for each activity is assumed
to be constant
*Basic network method
*Step:
*Preparing the activity list
*Identify the precedence relations among
activities
*Drawing the network to display predence
relationship graphically
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Event calculation
* tij = time to complete activity from event i to event j
*Ej = earliest time event j can occur based on completion of all predecessor activities
*Lj = latest time event j can occur without delaying the project’s completion
Procedure (forward pass)
*Set Ei= 0 for starting event
*Set Ej = maxi(Ei = tij) where the maximization occurs over all events i which are immediate predecessors of event j
Procedure (backward pass)
*Set Ln = En
*Set Lj = minj (Lj – tij) where the minimization occurs over all events i which are immediate successor of event j
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*Considers the uncertainty in activity time
*Suitable for R&D project types
*Required three times estimates for each activity
Optimistic time estimate (To)
Most likely time estimate (Tm)
Pessimistic time estimate (Tp)
*Assumes that the actual activity times are distributed according to the beta distribution
*When the individual activity times are uncertainty, the total project completion time will also be uncertainty
*Assumes that the distribution of project completion times is normal
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*The average or expected time :
*Variance for each activity i on the critical path
*S = √∑Rvar
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*Peluang Proyek (dipercepat atau diperlambat)
*T(d) : target (dipercepat atau diperlambat)
*TE : waktu estimasi (yang diharapkan)