004 Hubungan Ketergantungan antar aktifitas

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Hubungan Ketergantungan antar Aktivitas
1. Pola hubungan antar aktivitas (Sequencing)
Successor
Predecessor
A
B
C
D
D
A
Linier Activity
C
C
A
E
B
Merge & Burst
Activity
B
Burst Activity
D
ES
EF
Activity Name
A
d
LS
C
B
LF
D
Merge Activity
ES : Early Start
LS : Latest Start
d : Duration
EF : Early Finish
LF : Latest Finish
2. Bentuk Hubungan Antar Aktivitas
Predecessor
1
S
F
S
2
S
dalam ketergantungan "Finish-to-Finish" ,
successor tidak boleh selesai sampai aktivitas
predecessor selesai.
F
S
S
F
F
S
3
dalam
"Finish-to-Start"
relationship,
successor
tidak
bisa
mulai
sampai
predecessor selesai dilaksanakan
Successor
Dalam
hubungan
"Start-to-Start"
relationship, successor tidak boleh mulai
sampai predecessor mulai
F
F
Lag
4
S
F
S
Lead
S
F
F
Gunakan Lag time untuk
overlap atau delay.
Gunakan Lead time untuk
menjadualkan
kegiatan
lebih awal
Construction Method
3. Contoh Real Hubungan ketergantungan antar Aktivitas
Set 2nd Level
Column & Roof
Set 1st Level
Column & Beam
Land Clearing
(Cut & Fill)
Set Pilecap
Original
Land Contour
Piling
Installation
Set Sloof
4. Pemodelan LINEAR & CPM (Critical Path Method
MS Project menggabungkan
Pemodelan Linear & CPM
dalam satu model
5. Perhitungan Durasi Proyek (Forward & Backward Pass Calculation)
15
19
D
4
27
0
0
5
5
A
5
START
0
0
15
15
B
10
5
5
31
25
F
5
C
10
15
15
25
15
EF
31
31
G
6
25
31
E
6
Task
LS
21
FINISH
31
26
25
ES
31
30
25
25
LF
Total Slack
: LF - EF
Critical Task : ES = LS dan EF = LF
31
Total Slack : The amount of time
that a task can be delayed without
delaying successors task
6. Perhitungan durasi proyek yang menggunakan SS, FS, FF dan Lead/Lag
3
0
9
4
B5
A3
1
4
0
4
SS+1
4
1
B5
4
4
9
5
9
FS+1
C4
5
5
9
4
A3
10
C4
1
3
0
5
5
1
C4
0
B5
5
2
10
5
A3
9
4
3
0
9
Calculation of project duration using
Forward & Backward Pass
Aplikasi MS Project utk Input Hub. Antar Aktivitas
1. Prosedur utk memasukkan hubungan antar aktivitas
To link a whole range of
tasks and order them, select
the range of tasks.
Go to Edit > Link Tasks.
You can manually input
task predecessors
Lead
Lag
2
3
To order tasks, first, second, third,
etc., double-click on a task.
1
4
&
2. Check hubungan antar aktivitas melalui Relationship Diagram
1
While working on a large project, this
graphic view helps you to focus on one task
and the
tasks to which it is linked.
2
3
Relationship diagram
is a special version
of Network Diagram
Predecessors
Successors
This view displays the
current task in the
center of the pane
3. Peringatan bila terjadi Conflict akibat pola hubungan antar aktivitas
If a conflict exists, caused by
multiple dependencies or a
combination of dependencies
and constraints , Project will
give you this warning.
4. Tips bila terjadi Activity Dependency Conflict
1
Change the conditions that make the successor task dates fixed
2
Remove the relationship definition so that a successor relationship to the task in the
message no longer exist
3
Change the conditions governing the finish date for the predecessor (the task named in
the late date message) so that you can schedule the task to finish by the late date.
5. Tips bila Total Durasi Proyek lebih panjang dari yang direncanakan
1
Identifying the Critical Path.
2
Crashing the Schedule :
a
•Review with an intent to reduce task duration that are unnecessary
long
b
•Examine the predecessor and successor relationships and try to identify
the relationship that can change from Finish to Start to one of the
overlapping relationship (SS,FF, Lead-Lag schedule)
c
•Increase Resource Assignment for task that are not fix-duration
tasks.
d
•Schedule Overtime to reduce the number of regular work hours that a
task may take
6. Melihat Schedule dalam bentuk Calender & Precedence Diagram
Calendar view is useful when
entering a simple project and
reviewing what needs to be done
on a specific day
Precedence diagram Method (PDM)
The Network Diagram
view displays the
general flow of work
and the relationships
between the tasks of
your project
Specify how large or
small you would like to
view the diagram.
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