This video illustrates how to crash a project consisting of seven activities to the absolute minimum project time.
Пікірлер: 75
@brittanykoskie93614 ай бұрын
This went hand in hand with a homework problem I was struggling with. Thank you for your detailed explanation!
@The_Business_Doctor4 ай бұрын
You’re very welcome!
@zakiapayab72405 ай бұрын
I just watched this well explained video. Step by step solution to the end was very interesting.
@The_Business_Doctor5 ай бұрын
Thanks!!
@ranjanghosh43219 ай бұрын
Its very well defined. One question. While crashing you need to prioritise by longest path first, 4:50 but after that we need to prioritise either the burst/merge node or simple node. Here answer would be same but still for other problems it may differ.
@The_Business_Doctor9 ай бұрын
Yes, depending on the problem and parameters there can be more than one combination of crashing activities
@Mrgaryaaron12 жыл бұрын
Very well done.
@The_Business_Doctor2 жыл бұрын
Thank you! If you haven’t already, please consider subscribing!
@tehdavidshow Жыл бұрын
I have an example from my homework that is throwing me off. For activity D, the normal duration is 1 (day) and the crash is 3 (days). if I take the crash and subtract the normal duration I get -2 which doesn't seem right. Any advice on how to do that properly? All the rest of the activities have the crash duration smaller than the normal duration.
@The_Business_Doctor Жыл бұрын
Hi David, Well that is an interesting one. I suspect it might be a typo. I suggest you confirm with your instructor on that one. Mark
@OrganicAlumination10 ай бұрын
I really need this because online classes and these charts and the DNA strand map .... I hate how lost I can be.
@The_Business_Doctor10 ай бұрын
I’m glad they are helpful to you.
@et4918 Жыл бұрын
Thanks I cearly understand how to crashing a project. In fact, I think you teach better than my school's professer even English is not my mother tongue haha. Well teaching !!!!!
@The_Business_Doctor Жыл бұрын
Thank you very much for the kind words! I’m glad it helped you.
@aronkovacs9604 Жыл бұрын
one would think crashing a project would be a bad thing :))
@The_Business_Doctor Жыл бұрын
@@aronkovacs9604 One would think!
@user-lc5dy6io7e4 ай бұрын
Hi, if there was a scenario that at the end of crashing A-D-G and B-E-G paths (where both = 9 weeks) were you to find that the C-F path also contains 9 weeks (in which case all 3 paths are now critical paths), how would you go about it? Will you now reduce F as well as reduce E (from the B-E-G path) or is that not possible? Thanks
@The_Business_Doctor4 ай бұрын
If the critical paths are all 9 weeks, if you had the ability to crash activities you would have to crash an activity on EACH path so they all get reduced. You can’t crash F by one week (making C-F 8 weeks) and leave ADG and BEG at 9 weeks. The challenge is to be able to balance all of the critical paths. Hope this helps.
@jyotinegi74132 жыл бұрын
when crashing a project do we have to concentrate on task with least expensive gradient or path with least slack?
@The_Business_Doctor2 жыл бұрын
Hello Jyoti, You have be very careful with crashing. You would concentrate on the lest expensive crash cost that is ON the critical path (i.e. The path with zero slack). As you crash activities, the critical paths will change (you might end up with multiple critical paths) and you might have to move to a different path to find the next viable activity to crash. Ideally, you can crash a single activity that is on multiple critical paths. Crashing an activity just because it is the least expensive but isn't on the critical path is a waste of money because it won't reduce the project completion time. Hope this helps. Mark
@cerenaltntas45465 ай бұрын
Helal olsun kardeşim sana sayende dersi gecicem
@The_Business_Doctor4 ай бұрын
You’re welcome!
@adityabagayatkar1947Ай бұрын
Thank you for the explanation. Just One question. Why don't we crash A and E further ? we only consider A and E's crash week as 1
@The_Business_Doctor11 күн бұрын
A can be crashed by only 1 week (from 4 to 3). After that, there are two critical paths, so even if you crash E, you can't crash the path with A any more so you would be wasting your money to crash E.
@outofshadows2598 Жыл бұрын
Very well explained
@The_Business_Doctor Жыл бұрын
Thanks very much!
@user-dp2ln7yv3z Жыл бұрын
When crashing G, if the max crash for G is 2 weeks, why aren’t we subtracting 1 week from each critical path to get a 11 week critical path?
@The_Business_Doctor Жыл бұрын
Hi there. If you go to 8:20 in the video, you can see that G is crashed by 2 weeks getting down to 10 weeks. If you're asking why it wasn't crashed earlier, that's because D was less expensive. Hope this helps. Mark
@user-jt8xn7wx1m10 ай бұрын
Well explained, thank you
@The_Business_Doctor10 ай бұрын
You’re welcome!
@kennethkayeramos28588 ай бұрын
Hello sir. I have a question, the difference between normal time and crash time is the counts of crash?
@The_Business_Doctor8 ай бұрын
Yes. If the normal time is 10 days and the crash time is 8 days then the activity can be crashed by 2 days
@noorasilahizatie49797 ай бұрын
Hello sir, one question. When you crash E by 1 week, why you also minus the ADG path because theres no E in that path.
@The_Business_Doctor7 ай бұрын
Hi there. At some point you can end up with more than one critical path, so when you crash A, that reduced the time along A-D-G, but then B-E-G must also be reduced. You might be thinking of the part in the video where just before I take the time of B-E-G I took 1 off A-D-G -- that's because I missed updating my little crash table. Hope this helps. Mark
@Bigbuttducky Жыл бұрын
why dont we further crash B and E? was it because originally the critical path was ADG?
@The_Business_Doctor Жыл бұрын
Hi John, While we could crash activities B and E they won't reduce the total project time because we would have to also crash an activity along path A-D-G and all of those activities have already been crashed to as low as they can go. Spending money on B and/or E would be a waste because while the time on path B-E-G could be reduced, A-D-G would still be at 9 weeks. Hope this helps. Mark
@SS-pn7ss2 ай бұрын
Thank you so much
@The_Business_Doctor2 ай бұрын
You’re welcome!
@lokmanhakim857625 күн бұрын
Hi sir, may i ask - how do we get the Crash Time Values (in column 2) ? Also must the Duration Unit be standardized to weeks? or can it be any other time unit (i.e. man-days)?
@The_Business_Doctor11 күн бұрын
Hi there. The crash time values are provided, so there are no calculations required. You can use any unit you like: days, weeks, months, etc.. Hope this helps. Mark
@yunggoth85052 жыл бұрын
Could you tell me the name of the book please?
@The_Business_Doctor2 жыл бұрын
The textbook for that course was Heizer, J., Render, B., Munson, C., & Griffin, P. (2020) Operations Management (3rd Canadian edition)
@maramben4618 Жыл бұрын
why can't we crash more of B and E I don't clearly understand the reason ?
@The_Business_Doctor Жыл бұрын
Hi Maram, If you look at the summary at around 10:00 in the video, you'll see that after crashing to 7 weeks, both paths A-D-G and B-E-G are critical at 9 weeks. While you could spend money to crash B and E and get below 9 weeks you would be wasting the money because you cannot crash any more on A-D-G so it would still be 9 weeks. At this point you have more than one critical path and to be able to continue crashing, you must be able to crash activities on both paths otherwise you cannot proceed. Hope this helps. Mark
@AmirB-yc3yp5 ай бұрын
hi may i know the textbook you refer for the exercise. thanks!
@The_Business_Doctor5 ай бұрын
Hi there, The textbook for that one is: Operations Management: Sustainability and Supply Chain Management, Third Canadian Edition by Hweizer, Render, Munson, and Griffin ISBN 978-0-13-483807-6 Hope this helps. Mark
@joudham Жыл бұрын
why are the last two crashings for A and E considered 1 week together?
@The_Business_Doctor Жыл бұрын
Hi Joud. This is because at some point there is more than 1 critical path and to reduce the time by one week either 1 task that is common to both paths must be crashed or 1 task on each path must be crashed. In this case if you crashes A only that path would be reduced by one week but the path E is on will not. Hope this helps Mark
@kathestrella-ju8bc Жыл бұрын
@@The_Business_Doctor why isn't E multiplied by 3 weeks?
@The_Business_Doctor Жыл бұрын
@@kathestrella-ju8bc If you crash E by more than 1 week without crashing another activity an a different path, you would be wasting your money because the project time will not be reduced. Hope this helps.
@zain44942 жыл бұрын
thanks bro
@The_Business_Doctor2 жыл бұрын
You're welcome, Zain! If you like the videos, please consider subscribing!
@sanajan84914 ай бұрын
Why are we crashing D by just 1 week when we can crash it by 4 weeks?
@The_Business_Doctor4 ай бұрын
If you crash D the project time will not be reduced because at least one other path is still critical. You have to crash activities on each critical path by the same amount for the project time to reduce. We try to crash activities that are common to multiple critical paths to save crash cost but that’s not always possible.
@olo1135 Жыл бұрын
why we stop at 7 weeks and why did not go further why dont you tried to reduce E or B more
@The_Business_Doctor Жыл бұрын
Hi Olo, You can't go any further because the remaining activities that could still be crashed are not on the critical path. So you COULD pay money to complete them in a shorter time period, but it won't reduce the total project time, so you would be wasting your money. A valid reason for paying extra to free up the resources to complete those activities earlier might be to allocate the resources to another project. Hope this helps. Mark
@na50r246 ай бұрын
Wait a second: 4:05 The critical path is ADG? But you only did the forward pass, didn't you? Is that sufficient enough to determine the critical path? What about the backward pass?
@The_Business_Doctor6 ай бұрын
You only need to do a forward pass as long as you go through all the paths. The longest path is the critical path. You really only need to the the backward pass to determine what the slack for an activity is. All activities in the critical path will have zero slack but the other ones need the backward pass to determine the slack. Hope this helps!
@FABRlCE6 ай бұрын
column 6, 2nd difference is incorrect though, right?
@The_Business_Doctor6 ай бұрын
Hi there. Yes there is a typo there. Someone else had noted that before in a previous post which I confirmed. It doesn’t change the answer, however.
@FABRlCE6 ай бұрын
@@The_Business_Doctor super 💯
@joeyanneitorralba58618 ай бұрын
Hi! I would like some help in a project management problem. Can i send it via email?
@The_Business_Doctor8 ай бұрын
Sorry, I wish I could but I’m at my maximum capacity right now.
@yeesenghoo67115 ай бұрын
Why activity A and activity E can only reduced by 1 weeks, but both activities have crash time limits up to 3 weeks
@The_Business_Doctor5 ай бұрын
Just because an activity can continue to be crashed doesn’t make it should be because there can be other critical paths that have to be balanced so continuing to crash A and E won’t reduce the project time any further. You must carefully observe when other paths become critical and then try to crash activities line on all the path risk or find activities on each path that can be crashed by the same time to keep the path times balanced.
@tinotendakanyemba7948Ай бұрын
Hello Sir, So do you mean that every time we crash separate activities when we have 2 critical paths like we did for E and A we just crash once for both because in this case we had crash time limit of 3 weeks which we could do for both A and E to leave us with 7 not 9 weeks but we just crashed 1 week not 3
@riskaoktaviani1816 Жыл бұрын
i think max crash is 8 weeks not 7 weeks because total max crash is $1600
@The_Business_Doctor Жыл бұрын
Hi Riska, the maximum this project can be crashed is by 7 weeks to end up at a 9 week project time. The solution is correct. Mark
@PoeEdogawa2 ай бұрын
@@The_Business_Doctor Hello sir, can you explain why (in detail)? I'm so sorry, I'm still a little bit confused. Thank you in advance
@aronkovacs9604 Жыл бұрын
why the monkey bits is this called Crashing? :/
@The_Business_Doctor Жыл бұрын
Good question! We'll have to ask the Project Management Gods about that one.
@moyou5405Ай бұрын
I still think your speed is way too fast
@The_Business_DoctorАй бұрын
You can slow it down
@sabelozondo7179 Жыл бұрын
Kindly drop your email, please. I need help with project management activities.
@The_Business_Doctor Жыл бұрын
Hi Sabelo, you are free to email me at mark@strategema.ca to let me know what you are looking for.