Good luck!! Hope it went well 😁

Did u pass?

@@thatdonkeymercelot6409 bro, I have no idea. I must have passed. Its been yearssssss. hehe

Bro did u pass ?

Glad it helped!!!! =)

😂😂

😂😂😂😂

Thanks for the comment Amber! If you haven't already, check out all of the PM videos I made in the playlist or on the website here: engineer4free.com/project-management Cheers :)

Engineer4Free absolutely!! This has been a life saver while studying for the PMP exam!

Thanks for watching and commenting Arnold!

Glad to hear it! You can find the rest of my PM tutorials here if you need any more: www.engineer4free.com/project-management

Hey thanks for the awesome feedback! You can find a full list of the software/hardware that I use at www.engineer4free.com/tools

Awesome glad you found it! Make sure you check out engineer4free.com/project-management if you haven't already for the rest of the videos :)

🎉🎉

Good to know! Thanks for commenting!

Rey thanks. Yeah I did a lot of PM videos you can find them all here: engineer4free.com/project management

Typically they should go from left to right, that's the convention that people use. Just like how we read from left to write, we do network diagrams from left to right.

I see thank you so much :) :) :)

KZfaq FTW 🙌

You're welcome, glad to hear it!

Oh yeah, so with this style, every arrow should have a unique IJ number, regardless if that arrow is a real activity, or a dummy. And because G depends on B finishing, there must be a dummy that connects the end node of B with the start node of G, so that's why the dummy is there. Hopefully that makes sense.

Every arrow should go from a smaller number to a bigger number!

Thanks for watching!

Thanks for the comment!

Hey, I have some videos on more complcated relationships in projects, you can find them in videos 16-22 here: engineer4free.com/project-management and also some other videos on PERT which are numbers 39-46 in the same link. Should be enough to get started.

Hey Mafuj. I keep a current list of the hardware and software that I use at engineer4free.com/tools Its technically all hand drawn just with the aid of a drawing tablet and some video editing tricks

this question should have been asked by the guy and should have been answered in the video. We are beginners and we dont know most of the things. And it is fucking unclear

It's not possible because starting point and end point of two arrow can't be similar.

All activities with no predecessors are initial activities. Put it somewhere on the far left of the diagram near A and give them both an ES of 0. If F has some successors, just draw a really long line connecting F to it’s successors. You may need to attempt the drawing a few times to reduce crossovers. It might look stupid, but is totally possible.

Glad you liked it, thanks for watching! Do check out engineer4free.com/project-management if you haven't already for all the PM videos! 👍👍

Dummy has 0 duration. Use it to trace dependence but do not add any time when doing the forward or backward pass if you hit a dummy.

You're welcome!!

You can have multiple arrows out of one node (going to different nodes). You can have multiple arrows in to one node (coming from different nodes). What you cannot have is more than one arrow sharing the same beginning and end node. For example, in the first problem, look at activity D. It is the only arrow that goes specifically from node 3 to node 6. No two nodes are connected directly with more than 1 arrow between them. Does that make sense? Each activity can then be labelled uniquely by just referring to the start and finish node. We call that the ij number. Activity D's ij number is 3-6. No other activity has that number.

Engineer4Free Thank you very much. This helps a lot.

Glad you liked it! =)

It's not PM software, just hand drawn with a tablet. I've got a list of all the hardware and software I use in the videos at engineer4free.com/tools

A straight arrow between two nodes represents an activity in this style of network diagram. There is no such activity present in the table of dependencies that would go between nodes 3 and 4 (if there was it would mean there would be an activity that succeeds B and is succeeded by G). The dummy activity has to be there because it shows the dependence of G on B. Node 4 is the point in time where G starts, and node 3 is the point in time when B finishes; B must be finished by the time G starts, so hence the dummy going from 3 to 4. Watch this video: kzfaq.info/get/bejne/iqqinKuI067Ponk.html it is the predecessor (lol.. bad joke) to the video that we are commenting on and explains some things. These videos are all part of a larger playlist too, you can check it out at engineer4free.com/project-management this is video #11 in the course.

If you do that, E would become dependent on both B and C, which is not the case.

Hey, not sure what you mean. There is no point in the second example where the network diagram suggests that E is dependent on B and C. Can you clarify?

Oh no, i was just supporting your answer and trying to clarify it to Lucky Lucky that why we need the dummy arrow.

ahaha ok cool! Thanks for helping =)

Both are ES

Are you referring to the second diagram? It's because if we did that, then G and E would both have the same i,j numbers (be on the same arrow). We can't have that, so we need a dummy.

Hey, the nodes in this style are the points in time, whereas the arrows are the activities. Node 6 is the point in time when D is finished, and also when G begins. G does begin right when D finishes according to the diagram. The dummy that goes from 5 to 6 is there so that E and F have unique start and finish nodes compared to each other (id, don'e start and finish on the exact same nodes).The dummy allowed for the creation of node 5, which means that F finishes on node 5 rather than 6. But ultimately node 5 and 6 are the same point in time, just with a different label to help identify based on the style of this network diagram. This video is worth checking out too: www.engineer4free.com/4/introduction-to-cpm-network-diagrams

Thanks for watching! :)

Yeah, check this video too: www.engineer4free.com/4/introduction-to-cpm-network-diagrams

@@Engineer4Free ok i will

You're welcome Amit!

You're welcome =)

Hi, sorry for any confusion brought about by the naming of each style of diagram. There are two types of network diagrams: Activity on Node (AON) and Activity on Arrow (AOA). In these videos I usually refer to AON as PDM, and AOA as CPM. That's local lingo for me that I originally learned, but you are actually better to use AON and AOA, it's more clear.

Lolll. Good luck brother 🙌

This is an Activity on Arrow (AOA) diagram. Each activity (arrow) must have a unique start node and end node (no two arrows can point from the same start node to the same end node. See videos 10-12 here: engineer4free.com/project-management

You're welcome, thanks for watching!

Yeah no problem. This is an Activity on Arrow network diagram, and one of the rules about these things is that only one arrow may go between two given nodes. ie, node 4 and 6 can only have one arrow connecting them directly, not two. By doing this, we can identify any given activity (arrow) by it's i-j number, and in the case of activity E, that would be 4-6. It's just the convention, so because two activities here go between nodes 4 and 6, we need to introduce the dummy activity that gets its own node (5). Either E or F could have had the dummy, but one of them needs it in this project.

Thank you!@@Engineer4Free

@@Engineer4Free HI, so whats the ij number for F 4.5.6? 4.5? 4.6?

S’all ya need

There can be more than one initial activity. So if activities A and E of your project for example don’t have predecessors, draw them both near the left side of the diagram, and then draw their successors coming out to the right.

A - 8 B - 10 C A 7 D B 8 E B 22 F C,D 12

Video*

loll your WELCOME!!

You’re welcome!!! =)

Yes there may be more than one right answer depending on the question. Some problems may not require dummies. The right answer(s) will have the least amount of dummies. If there is a way to draw with diagram with less dummies that you have done, then you do not have the right answer. Check out videos 10-12 here: engineer4free.com/project-management

It is just a requirement of this style of network diagram that any two given nodes only have one single arrow connecting them. It gives each activity (arrow) a unique identity of which node it comes from and goes to. Because two arrows would ideally go between 4 and 6, we need to introduce the dummy node 5 so that one arrow goes from 4 to 6 and the other goes from 4 to 5.

There should be a table of dependencies that indicates the relationship between activities

Yupp basically

How'd it go 😅

Yes I did, see videos 18 - 22 here: engineer4free.com/project-management

Ah yeah there is another video that I introduce the method and go a bit slower in, check it out here: engineer4free.com/4/introduction-to-cpm-network-diagrams

😍

😏

AWESOME

:p

hahaha yeah it's not the most intuitive thing

No problem. I'll just let you know that this video is part of a playlist though and comes after a full section on PDM network diagrams and an introductory video on CPM network diagrams. Check out the full curse at engineer4free.com/project-management I recommend watching video 10, and if you have the time, videos 1-12. They build off each other, so by the time you get to this video, you'll have sufficient exposure to this kind of stuff =)