EXAMPLE

This example from the IT industry, uses the AoN (precedence) method of network drafting. This is now the standard method for this industry, probably because of the influence of MS Project and because networks in IT are relatively small, when compared to the very large networks in construction which can have between two hundred and several thousand activities. The principles are of course identical.

A supermarket requires a new stock control system linked to a new check-out facility. This involves removing the existing check-out, designing and manufacturing new hardware and writing new software for the existing computer, which will be retained.

The main activities and durations (all in days) for this project are as follows:

Days

A

Obtain brief from client (the supermarket owner)

1

B

Discuss the brief

2

C

Conceptual design

7

D

Feasibility study

3

E

Evaluation

2

F

Authorization

1

G

System design

12

H

Software development

20

J

Hardware design

40

K

Hardware manufacture

90

L

Hardware delivery (transport)

2

M

Removal of existing check-out

7

N

Installation of new equipment

6

P

Testing on site

4

Q

Hand over

1

R

Trial operation

7

S

Close out

1

The network for this project is shown in Figure 26.10, from which it can be seen that there are virtually no parallel activities, so that only two activities, M (Removal of existing check-out) and H (Software development) have any float. However, the float of M is only 1 day, so that for all intents and purposes it is also critical. It may be possible, however, to start J (Hardware design) earlier, after G (System design) is 50% complete. This change is shown on the network in Figure 26.11. As a result of this change, the overall project period has been reduced from 179 days to 173 days. It could be argued that the existing check-out (M) could be removed earlier, but the client quite rightly wants to make sure that the new equipment is ready for dispatch before removing the old one. As the software developed under H is only required in time for the start of the installation (N), there is still plenty of float (106 days), even after the earlier start of hardware design (J) to make sure everything is ready for the installation of the new equipment (N).

In practice, this means that the start of software development (H) could be delayed if the resources allocated to H are more urgently required by another project.

Figure 26.10 (Duration in days)
Figure 26.11 (Duration in days)
Project Management Made Easy

Project Management Made Easy

What you need to know about… Project Management Made Easy! Project management consists of more than just a large building project and can encompass small projects as well. No matter what the size of your project, you need to have some sort of project management. How you manage your project has everything to do with its outcome.

Get My Free Ebook


Post a comment