Activity on Arrow AoA Network Diagrams

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					               Activity on Arrow (AoA) Network Diagrams

             K depends on A, B                 K, L depends on A, B

                A                              A                K

                                 K
a.                                       b.


                B                             B                  L


     K depends on A, B and L depends
     only on B                         K depends on A but L depends on both A, B

         A                  K                   A                     K



c.
                                        d.
        B                   L                   B                     L
      A                    K
                                                     A                K



      C                                   f.          C                   M
e.



      B                   L
                                                     B                 L

K depends on A, C and L depends on B, C
                                               K depends on A, C; L depends on B, C
                                                       and M depends on C
                          Air Traffic Control Tower

A proposed ATC tower uses a control console which has to be meet the needs of the
    particular airfield.

    Activities Involved                                       Duration (weeks)
Design console                                                           3
Order console                                                            2
Fabricate and deliver console                                            16
Install console                                                          2
Test console                                                             4
Design tower                                                             5
Design foundations                                                       1
Order foundations material                                               1
Deliver foundations material                                             1
Construct foundations                                                    1
Order tower construction materials                                       2
Deliver tower construction materials                                     3
Erect tower                                                              8

1. Draw the AoA network diagram (assuming that design of the foundations is dependent on
     the design of the tower).
2. Fill in all the information in the Table’s outline of the Early, Late, Floats and determine the
     Critical Path
                      AoA Network Diagram (ATC tower)



    Design console                        Order console                         Fabricate and deliver console
                               2                                  4
              3                                   2                                16



                                       Order           Deliver
     Design           Design           fnd.            fnd.                Construct          Erect             Install        Test
     tower            fnds.            material        material            fnd.               tower             console        console
0                 8            10                 12                  14                18                20              22             24
        5               1                 3                3                3                   3                3                3




                            Order tower                   Deliver tower
                            material                      material
                                                  16
                                   3                              3
Activity   Duration      Description             ES   LS   EF   LF   TF   FF   Critical
                                                                                Path
  0-2         3           Design console         0    0    3    3    0    0       *
  0-8         5            Design tower          0    3    5    8    3    0

  2-4         2            Order console         3    3    5    5    0    0       *
 4-20        16        Fab.& deliver console     5    5    21   21   0    0       *
 8-10         1            Design found.         5    9    6    10   4    0

 8-16         2        Order tower materials     5    8    7    10   3    0

 10-12        1       Order found. materials     6    10   7    11   4    0

 12-14        1       Deliver found. materials   7    11   8    12   4    0

 14-18        1          Construct found.        8    12   9    13   4    1

 16-18        3       Deliver tower material     7    10   10   13   3    0

 18-20        8             Erect tower          10   13   18   21   3    3

 20-22        2           Install console        21   21   23   23   0    0       *
 22-24        4            Test console          23   23   27   27   0    0       *
    Note: When to use IDENTITY and LOGIC “dummy”
          activities indicated in the CPA notes on
                 Prof. Rowlinson’s Y2 notes
Refer to:
Lockyer, Keith (1984) Critical Path Analysis and other Project Network
  Techniques, Pitman, London. (pg 19-22)
Main Library 658.4032 L81