Dummy Activities

An introductory video explaining the use of dummy activities in activity networks.

[jessiekarku]

Thank you soooo much!!! Your tutorial literally saved me from the dummy path!!!

[brendaleigh]

Thank you! I had crazy lines all over the place that did not make sense. This totally helped me to clean it up. I am very grateful

[Mahmoud-yskt]

Had already added a lot of clarity
Thank you

[dante]

Could you please elaborate more on the exercise on why activity E is not a dummy activity towards activity G. By the way, this was an awesome video.

[jowiesingh]

Thank you ! I will now pass my exams !

[parama_padida_dei]

real answer: if you drew arrows C and D to meet at one node (no dummy variable) and then have arrow E coming from that node, you will find that you CANNOT draw arrow F from any node to show that its predecessor is only arrow C and not D. That is why we need a dummy variable. There is no need for a dummy variable from E to the node before G since it is totally fine to have multiple arrows go to the same node as long as the arrows come from different starting nodes.

[solomonaidoo]

Hello, Mark Judd please can you help me with the CPM network logic diagram with predecessor and successors.

[bilalhussainmagxi]

Sir i need your help i have to submt my work but two diagrams are not solving me

[jowiesingh]

I recommended this to my colleagues!!!1!11!!1

[Jum-by]

Can't wait to learn about this, just for dummies to probably not end up on the test anyways (still good video tho)

[FuseConductor]

One activity can have only one arrow ... if two activity are preceded by one activity then there must be a dummy because if you are going to put two arrow that means you are doing same activity two time. Why you will do same activity two time, give it a dummy . @dante 👇👇👇

[tether]

In the 2nd example why doesn't E start from C? Is there a difference between direct predecessors

[tumul]

thank you much sir !! this helped me a lot

[konitsacity]

At least i did understand it!! Thank soo much!