项目计划

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Simple dependencies
 Start and Finish constraints only
 Forward/backword calculation
 Slack calculations
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S
F
SS-Start to Start（开始-开始）
A
SF-Start to Finish（开始-完成）
FS-Finish to Start（完成-开始）
B
S
FF-Finish to Finish（完成-完成）
F
FS-Finish to Start
3
FS 3
A
5
C
5
B
0
5
10
FS 3
A
B
C
15
SS Start to Start
SS 3
A
B
Example: A-Digging Ditch
B-Laying Pipe
0
10
3
20
30
Time
A
B
SS 3
10 days
10 days
FF Finish to Finish
FF 4
B
C
Example: B- Laying Pipe
C-Filling Ditch
0
10
10 days
10 days
20
30
FF 4
Time
B
C

B
C
A
D
E
F

A
B
C

D
E
F

A
EARLY
START
B
D
C
E
DURATION
ACTIVITY
ID
LATE
START
FREE
FLOAT
F
EARLY
FINISH
TOTAL
FLOAT
LATE
FINISH
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Total Float(Slack)=LST-EST，即某项活动最晚

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Free Float(I,j)=EST(j,k)-EFT(I,j)
(j,k)为(I,j)的紧后作业

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Conditional diagramming methods

T h e M ile s to n e P la n
D a te
S tr a te g y
P r o d u c tio n
T h e P r o je c t
F in a n c e
L a u n c h in g P R O D U C T
S 0
1 .1
S 0 = P r o je c t s ta r t-u p
S 1
0 1 .fe b
S 1 = S tr a te g y is d e c id e d
F 1
0 1 .m a r
F 1 = F u n d s a r e g r a n te d
P 1
0 1 .a p r
P 1 = M a c h in e s a r e b o u g h t
P 2
0 1 .m a i
P 2 = M a c h in e s a r e in s ta lle d
S 3
0 1 .ju n
S 3 = S ta k e h o ld e r s a r e in fo r m e d
P 3
0 1 .ju l
P 3 = W o r k e r s a r e id e n tifie d
F 2
0 1 .a u g
F 2 = T o ta l b u d g e t a p p r o v e d
S 3
0 1 .s e p
S 3 = O r g a n iz a tio n a p p r o v e d
P 4
0 9 .s e p
P 4 = F u ll p r o d u c tio n s ta r te d
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of times)，这个窗口的极限是：
◦ 尽快原则(As Soon As Possible-ASAP)
◦ 最迟原则(As Late As Possible-ALAP)
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”Once you`ve created your masterplan, on the back
of an envelope or a print-out from your computor,
carry it around with you all the time.
Take it home with you overnight and sleep with it by
the bed (providing you have time to sleep)
That way, if anything occurs to you, you can add it at
once. If you need to check anything, it`s right
there. If you panic you haven`t done something,
you can look to see if it is ticked off.
So long as you and the masterplan are inseparable,
you`re fully in control.”
”Whether or not you are a natural list-maker,
you`ll find you get a huge pshychological
boost from getting things down on paper. It
clears your mind hugely, because once a
thing is written down, you no longer have
to remember it. The project will instantly
look and feel more manageable”
1.
2.
3.
4.
5.
6.
7.
Only plan for 4-6 months ahead
Make good time judgements, including
minimum and maximum
Limit activities to 1-2 weeks workloads
Calculate with 3.5 days per week
Assume important decisions take 2-3 weeks
Mark out all important milestones
In a large project，the number of critical
activities is usually 10% of total activities

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《项目管理教程》第6章练习 第20题
（双语教学版 P194）
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