Multiple dependency activity on node (AoN) networks ( lecture )

Four possible dependencies between activities Finish-to-start (or normal) dependency Start-to-start dependency Finish-to-finish dependency Start-to-finish dependency

Finish-to-start (or normal) dependency a b

Start-to-start (or lag-start) dependency x y Example: the air-conditioning should be started in a building a given time before visitors are let inside

Finish-to-finish (lag-finish) dependency c d Example: c: writing a chapter to a book d: editing the whole book lag: acceptance of the chapter by the reviewer

Start-to-finish dependency a b Example: a: production with a new machine b: quality check lag:to ensure the coverage for the test production with quality checking

Dependencies can be used in combination Start-to-start & finish-to-finish: a 0 3 ? b 5 9? ? ? Example: a: marketing action b: measuring the effect of the action lags: the effect needs time to appear, and to fade out

Floats on multiple dependency networks Total float = LFT – EST – Duration Early total float = LFT – EFT Late total float = LST – EST In case of multiple dependence free float cannot be calculated

Solution a b

Calculations with finish-to-start lags a b 3 c 3 f 3 d 3 e 3 g 3 h

a b c f d e g h

Various dependencies a b 2 c 3 f 1 d 4 e 4 g 5 h Dangler activities!

Various dependencies a b c f d e g h

Practicing a b 3 d 2 c 7 e

a b d c e

Reading Textbook chapter 15

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