Project crashing full example (part 1/2)

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Project Management Tutorial: Project crashing full example (part 1/2).
There is an annotation that shows up at 8:39. If you are watching on a mobile device, you won't see it. It says "Sorry, I accidentally wrote TF=1 for B, I meant to write TF=1 for C... I catch this error in part two of the video." - So yes, for B, TF should be 0 and for C, TF should be 1. Also in the table of dependencies, there was a typo in the predecessors for activity E. It's predecessors should be C and D, which is what I did in the network diagram.
Video explaining project crashing: • Project crashing expla...
Part 2 of this example: • Project crashing full ...
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[@nicholeh1280]

So very helpful! This and part two. I would not have gotten this right from just reading the text book.

[@Engineer4Free]

Thanks for letting me know, glad to hear it :)

[@pratiklohar4566]

Undoubtedly Best Explanation on Crashing Ever ...!! U made one small mistake while writing TF in run-2.

[@Engineer4Free]

Hey Pratik thanks for watching and pointing it out! I believe I have mentioned it in the video description, but thanks again!! Do check out part two as well 🙂

[@knifewars5131]

Very useful. I didn't know wich activity of the critical path crash first.

[@clemencejacob4159]

quite helpful. It requires practice oftenly

[@abdullahtahir3693]

In run 2 there will be total float of 1 at C but you write it in B row correct it sir 👍

[@a_potat]

quick question. why not have the start as 1? since the first day is one , then start day for the next activity to be end date of first act+1?

[@sojanmathew6764]

Hello! I have problem same related to this. How can I contact you for this ? Thanks

[@baijumehta8495]

Thanks for a wonderful and very clear explanation. Would like to know which tool did you use for drawing the Network Diagram.

[@Engineer4Free]

Thanks Baiju! I used Sketchbook and a Bamboo Wacom drawing tablet. The full list of my hardware and software that I use to make the videos is here: engineer4free.com/tools

[@baijumehta8495]

@@Engineer4Free Thanks a million. Have watched all your Project Management Videos.. All of them are awesome.

[@jasoncysiu]

You saved ooour life in 9 minutes -- something that the DOCTOR (or so called PhD) cannot even do! Legendary!

[@SlimJimBigWin]

Thanks for the video, there is a typo in the predecessor column since the predecessor of E is also E and there is an F while there is no F as an activity.

[@Engineer4Free]

Thanks for pointing that out! I added in an annotation at 0:22 correcting the typo.

[@nada2excoo]

Thanks a lot for your videos. Can you tell me how you calculate crash duration?

[@Engineer4Free]

Thanks for the comment! Crash duration is typically just given to you in these types of problems, and has to do with the physical limitations of how fast the activity can be performed. Imagine that the project is a house build, and one activity is painting. The painters might tell you that they will take 6 days to paint, but if you pay a higher rate, they will bring out a larger crew and it will take them only 4 days. They know that their full crew can still only paint so fast, and the amount of painting required will take their full crew 4 days. Mmmmm that's just the first example that came to mind, does that make sense?

[@mazrimamat9899]

Useful information about project crashing.Thank you

[@Engineer4Free]

Great! More over at engineer4free.com/project-management too 😁

[@sibusisombhele3880]

Thank so much you are such a blessing, God bless you

[@Engineer4Free]

Your welcome, thanks for the comment :)

[@TheAbdallahalmassri]

Amazing succinct explanation. thank you

[@Engineer4Free]

Glad it was helpful! Thanks for watching =) the full playlist is here: engineer4free.com/project-management

[@mushayatikamal7890]

Thank you for this link Dr.

[@Engineer4Free]

You're welcome. The whole PM playlist is here: engineer4free.com/project-management =)

[@phanminhquan1285]

Appreaciated this a lot. Thank you

[@Engineer4Free]

Thanks for letting me know :)

[@sylvamadu3721]

super useful dude!!!! Thanks man

[@anitap.4472]

How would you calculate the Net Profit?

[@mohammedabdalhadi1798]

In Run 2 the project cost cannot be reduced as long as the duration is reduced

[@brahimelboudani601]

I just want to get this right. You said we should start crashing the activity with the lowest cost on the critical path. B= 400 and E=500. Could you please explain why you crashed E first? I a bit confused there

[@christianrazvan]

B is 600 , C is 400 but not on the critical path

[@brahimelboudani601]

thanks

[@kostasgeorgop]

hello! thanks for the videos. on run 2 Tf=1 should be on activity C or am I wrong?

[@Engineer4Free]

Thanks for pointing that out. There is an annotation catching that error but it will not display if you are viewing on a mobile device, and also might not show up on desktop if you have adblock. I updated the video's description with the correction.

[@kostasgeorgop]

Engineer4Free yes I also saw the next video that you also point out the fault! :)

[@dankd1069]

instead of overhead cost what if it said company will get x amount of reward per day if completed early? how would we amount that

[@Engineer4Free]

Pretty much the same approach. Just sum up the cost of all activities, and that will be your total project cost before crashing. Add any costs that you incur by crashing, and subtract the reward for each day that you shorten the project by.

[@dankd1069]

thanks so much

[@peterlisena3509]

How would you find the minimum expected time that a project can be completed?

[@Engineer4Free]

Before crashing? Just do the forward pass to find the project duration. If we're talking about minimum crashed duration, then follow the steps in this video and watch part 2, as well as the explanatory video. Links should be in the description.

[@kavilenraaj3084]

Can I know why you didn't choose activity c which is 400 is cheap to crash?

[@Engineer4Free]

It's because initially Activity C is not on the critical path. You'd have to crash it twice AND also crash activity D for it to have an impact. Cheaper to take E and B first. See part 2 of this example: kzbin.info/www/bejne/ZqClhquopd-Knq8 as D and C eventually do get crashed

[@fahimqasimi2481]

Great job. Thank you!

[@Engineer4Free]

Your welcome Fahim!

[@Feri9]

there is typo at 9:35,total float in table should be 0 for B and 1 for C

[@Engineer4Free]

Yeah thanks for pointing it out. The typo is acknowledged in the video description, and I saw your comment on the part 2 video too =)

[@alaamohamed-vt9xq]

in the first crash process when crashing the duration from 18 to 17, should we also remove the cost of one day from E activity so the new total cost would be 16,900 instead of 18,800 and do the same for the other crashes

[@Engineer4Free]

Hey good question. In general, no. If Activity E has a normal cost of $1,900 for the entire activity, then we should assume that it retains that base cost of $1,900, and only add the $500 (cost per day to crash) for each day that we crash it by. So in this case, we spend an extra $500 to crash it by a day, and the base cost is unaffected. So then Saving the $600 in project overhead, we just reduce the total project cost by $100 overall in this step.

[@alaamohamed-vt9xq]

@@Engineer4Free what about the last crash for 2 days crash at the same cycle (for D & B), why we did not use 1000 USD for 2 days instead of 500 for one day

[@alaamohamed-vt9xq]

sorry for D & C

[@samuelutsu7263]

awesome and very detailed. thank you

[@Engineer4Free]

You're very welcome!

[@asi1968]

C has a total float of 1 Or I’m getting this wrong ?

[@shibadaddy8639]

you are the professorrrr

[@joeytadayo6941]

I thought you first calculate the slope to determine which is the lowest amount to crash

[@sunilchanda1212]

can you tell me what actually is overhead cost is it labor charge and activity cost means material cost??

[@Engineer4Free]

Overhead cost in this example would be additional costs to the project that aren't associated with any particular activity. For example, a flat rate for a project management fee or 24/7 site security if it was a construction project etc. Also, considering material and labour costs separately for the activities is beyond the scope of this example.

[@sunilchanda1212]

thanks for quick reply

[@mariaerickanicolas]

Thank youuu!!

[@Engineer4Free]

You’re welcome!!!

[@henryanda425]

Nice video very helpful....but the predecessor for activity E is C & D not E & F please correct that.

[@Engineer4Free]

Yeah sorry about that, it's a typo. I made a not of it in the video's description.

[@divinelymoi]

How do you calculate the crash duration?

[@Engineer4Free]

Hey, try video number 27 here: engineer4free.com/project-management or here is the direct link: www.engineer4free.com/4/project-crashing-explained

[@ahmadammar9516]

Nicely explained....but seems a typo here: how come table on the top shows 'E,F' as predecessors to 'E' ?? I believe these are 'C,D'

[@Engineer4Free]

Hey Ahmad, good eye. Yes that’s a typo, there’s a note in the video description that acknowledges it. Thanks for pointing it out, and I sorry for any confusion that it caused!

[@ahmadammar9516]

@@Engineer4Free my bad!..i missed the note. Thanks

[@Engineer4Free]

🙃

[@stellathai4999]

how can you figure the total float?

[@Engineer4Free]

Hey Stella, see videos 13, 14, 15 here: engineer4free.com/project management for total float

[@allysamariejipus4247]

Hi. Isn’t the project cost on run 1 supposed to to be 18,400? ..

[@Engineer4Free]

Hey, it should be 100 less than the initial condition. Because we pay 500 extra to crash, but save 600 on the overhead of one day. So it will be 18,800 after run 1.

[@allysamariejipus4247]

Oh.. thank you

[@Hgb9999]

can i knw book where u got question?

[@Engineer4Free]

I made it up myself 😊

[@user-ui6bd6zj5u]

I think you made a mistake in TF of the second round, am I right?

[@Engineer4Free]

There is an annotation that shows up at 8:39. If you are watching on a mobile device or using adblock, you won't see it. It says "Sorry, I accidentally wrote TF=1 for B, I meant to write TF=1 for C... I catch this error in part two of the video." - So yes, for B, TF should be 0 and for C, TF should be 1.

[@fatimahhafizahmamat4340]

Thank you

[@Engineer4Free]

You're welcome!

[@cartoonchannel1480]

How you are calculating the additional cost

[@Engineer4Free]

In this example it is just given in the original table in the far right column. That would be pretty common in an exam situation to be given the cost and just have to deal with it, not calculate it with no other information.

[@cartoonchannel1480]

Thanks

[@anishsule3283]

Good stuff..God Blessed

[@Engineer4Free]

Thanks Anish!!! =)