Calculating Critical Path with Forward and Backward Pass - Key Concepts in Project Management

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  • Опубліковано 4 лис 2024

КОМЕНТАРІ • 63

  • @ShihanMeegasdeniya
    @ShihanMeegasdeniya Рік тому +11

    My friend. You have no idea how helpful this is. I appreciate this from the bottom from my heart. This helped me to do my pm assignment. Thanks again. ❤

  • @MrSilviut
    @MrSilviut Рік тому +10

    So many other videos just ignore the plus one minus one thing which makes it so confusing. Thank you for explaining that. Well done.

  • @susanwebberhershe1893
    @susanwebberhershe1893 7 днів тому

    You have a gift for simplifying a concept that can seem complicated at first glance.. and I have a finance degree. lol

  • @andreanberry4273
    @andreanberry4273 Рік тому +7

    Hi David - For people new to this please announce that you are using the "accepted convention of the project starting on Day 1." I was confused until I saw it on page 211 in the PMBOK 6th Edition. I couldn't figure out where you were getting the number 1 from. These are excellent videos by the way! Thank you so much!

  • @oliviab2388
    @oliviab2388 28 днів тому +1

    This was really excellent; very clearly and logically explained. THANK-YOU!

  • @Bell-uf9fn
    @Bell-uf9fn 6 місяців тому +1

    Hey David! I just wanted to say a huge thank you for your help in explaining the process and providing an example. I was able to create my own version based on your fantastic example. I really appreciate your videos, and I've been sharing them with my PM colleagues too. You're really good at explaining things in a clear and concise way. So, thanks for taking the time to make these videos and sharing your expertise - it's really helped me out a lot. Thanks again!

  • @Jfealy
    @Jfealy 4 місяці тому +1

    Awesome presentation. Thank you. PMP - here I come.

  • @videogamesare1
    @videogamesare1 Рік тому

    Thanks David, this helped explain the backward pass very clearly.

  • @LekhaJD
    @LekhaJD 10 місяців тому

    Thank you! Your explanation easily clarified a lot of my doubts.

  • @konsichguyita5246
    @konsichguyita5246 Рік тому +1

    Wow you described this easiest possible way. Thank you!

  • @Lexyvil
    @Lexyvil 18 днів тому +1

    There's something I don't get. I remember reading somewhere that the formula for Early Finish is supposed to be "Early Start + Duration", yet each of the Early Finish slots in this video somehow has "1" substracted to them (Early Start + Duration - 1 = Early Finish), which kind of complicate things more.
    If that wasn't the case, it would also makes it simpler when doing the backward pass, where if you can do "Late Finish - Duration = Late Start" instead of "Late Finish - Duration + 1 = Late Start" , and when you backtrack from the Early Finish to the Late Finish of the precious cell, that's when -1 can be applied with no issue. Aside from that though, very helpful! Thanks for the refresher!

    • @davidmclachlanproject
      @davidmclachlanproject  18 днів тому +1

      You are right. I've checked this out quite a bit - the only reason for the plus / minus one is so we get the correct Critical Path duration at the end. Without that, we end up with an extra day at the end (add up the durations to see what I mean). Otherwise, the available Float is the same for either method (using plus/ minus or not using it) 🙂

  • @schiefele5514
    @schiefele5514 2 роки тому +3

    You are the best, better than my professors!

  • @KWENDOJOHNOKWOMOLE
    @KWENDOJOHNOKWOMOLE 4 місяці тому +1

    simaaaaaart ....That was very reliable. A perfect presentation. Shukran madze❤❤❤❤❤❤❤❤❤❤❤❤👌👌👌👌

  • @nimmadhillonz
    @nimmadhillonz Рік тому +4

    Hello David, great video, you really make it clear. The only think which through me off in your explanation is that you are using the +1 and -1 for the ES and EF. Is that necessary? In other explanations they didn't do it. Thanks for the answer!

    • @davidmclachlanproject
      @davidmclachlanproject  Рік тому +3

      Yes you are right, they are not needed and it's simpler without them. I have adjusted this in my course 🙂

    • @mopremo
      @mopremo Рік тому +1

      Does that mean you made a new video explaining it without the +1 and -1? 😊

  • @crossfamilyfun
    @crossfamilyfun Місяць тому

    Thank you for making this so easy to see.

  • @sargamkapoor1899
    @sargamkapoor1899 Рік тому +1

    All your vides are great and so helpful

  • @kennguyen1066
    @kennguyen1066 Місяць тому

    Two methods:
    - start at day 1
    - start at day 0
    Start at day 1, you will need to add/substract to adjust the duration. If start at day zero, no need to do extra math.
    David uses day 1 as starting point. Both works the same, but I prefer starting at day zero, it’s so much easier.

  • @NolanLewis-p6d
    @NolanLewis-p6d Рік тому

    Excellent way of teaching

  • @kevinjamal836
    @kevinjamal836 2 роки тому +2

    You've made this so simple!! Thanks man

  • @zuzanalima8742
    @zuzanalima8742 Рік тому +2

    Hello David, great video, you really make it clear. The only think which through me off in your explanation is that you using the +1 and -1 for the ES and EF. Is that necessary? In other explanations they didnt do it. Thanks for the answer!

    • @davidmclachlanproject
      @davidmclachlanproject  Рік тому +3

      Yes, I think you are right! The way in this video is from the PMBOK guide, but yours is an easier way and it still gets the same outcome 🙂

    • @zuzanalima8742
      @zuzanalima8742 Рік тому

      @@davidmclachlanproject Awesome. Thank you very much for the quick reply. Really appreciated!

  • @charlotteybradley7579
    @charlotteybradley7579 Рік тому +1

    David, You are amazing. Your explanation was so much better than.... I wont mention any names 😀🤣

  • @london12327
    @london12327 Рік тому

    You made this look very simple !!

  • @jadwigapolak2161
    @jadwigapolak2161 8 місяців тому +1

    Very well explained!

  • @Canadianehhhhh
    @Canadianehhhhh 5 місяців тому +1

    Thank you for explaining this 100% better than the garbage instructions I received from my project management essentials course at SAIT.

  • @wflzoom6219
    @wflzoom6219 2 роки тому +13

    Whats been throwing me for a loop on these CPA's I have been watching a few, and the -1 and +1 to compensate for the starting ES of 1, instead of zero. is there a reason why the first activity ES in some diagrams starts with 0, and others with a 1 ? or is this just preference?

    • @mopremo
      @mopremo Рік тому +1

      I had the exact same question!

    • @Alldidas
      @Alldidas Рік тому +2

      @@mopremo Same, I think the best practice is to utilize 0 as your earliest start. Typically everything else starts with 0

    • @Alldidas
      @Alldidas Рік тому +1

      @@mopremo Your early start on your second task should match the earliest finish on your first.

    • @mopremo
      @mopremo Рік тому

      @@AlldidasThank you!

  • @afshanlakdawalla
    @afshanlakdawalla 2 роки тому +1

    Absolutely made simple...thanks so much!

  • @MrAbitha123
    @MrAbitha123 Рік тому

    Hi David, I am preparing for the PMP exam, and your videos have been incredibly helpful! I have a question, In the video, you said that the Early Finish (EF) date is calculated using the following formula: EF = ES + Duration - 1, however, the PMI website states that the EF date is calculated using the following formula: EF = ES + Duration Which formula is correct to use for the PMP exam? Thank you for your time and consideration. I appreciate your help.

    • @garrettbell8419
      @garrettbell8419 Рік тому

      the plus one and minus one is just compensating for starting the first activity at '1' instead of '0'(including the work done in day 1 in your duration). It confused me as well initially. I hope this helps.

  • @myramyra2
    @myramyra2 10 місяців тому

    Great breakdown explanation. New subscriber

  • @zuzanalima8742
    @zuzanalima8742 Рік тому +1

    Hello David, thank you again for all your great videos, you are doing for the PMP students. Not using anythig else now and its very efficient! 🙂But the only thing I am struggling now is to manage the time with the Diagrams questions (the Critical path questions and other one when you need to fill in all the boxes or do longer calculation. If I have in avarage 3 min for quetion, there is no change I can do it. Do you have any tips how I can improve the speed of solving these questions?? I am pretty sure, other students have the the similar problem. Thanks a lot!

  • @mdshahzebrahman7223
    @mdshahzebrahman7223 Рік тому +1

    Very helpful, thanks!

  • @elhamboostani8718
    @elhamboostani8718 23 дні тому +1

    Amazing☺

  • @Ola92408
    @Ola92408 2 роки тому +3

    How can you answer this kind of questions quickly on the exam without overthinking? Do you have any tips or that? Thank you.

    • @davidmclachlanproject
      @davidmclachlanproject  2 роки тому +3

      With these, there won't be many questions on it (I had around 2-3 and that was before the new Agile format). They're mostly around either critical path (just calculate the longest overall path) or float (a task's late finish minus its early finish). With that, plus the general knowledge of it (i.e this video) you should do fine 🙂

    • @Ola92408
      @Ola92408 2 роки тому +1

      @@davidmclachlanproject thank you. I'd practiced it on paper using your way and it totally makes sense. Thank you for the great video!

  • @HlumelaMkabile
    @HlumelaMkabile 3 місяці тому

    Very helpful 😢

  • @calciumdd7696
    @calciumdd7696 11 місяців тому

    this helps me prep before my exam hahah

  • @yuliiavenhlovska9028
    @yuliiavenhlovska9028 2 роки тому +1

    Can you please explain how the duration was calculated for activity 2? You calculated 4-3-1

    • @davidmclachlanproject
      @davidmclachlanproject  2 роки тому +1

      Do you mean the late start during the backward pass? It is the late finish minus duration plus one: 15 - 5 + 1 = 11. Durations themselves are just estimated at the beginning 🙂

  • @TheLilboy6
    @TheLilboy6 Рік тому

    Love you mate

  • @mariasv1142
    @mariasv1142 2 місяці тому

    In my class, we are not adding and minus 1. I am confused

  • @YogeshPatil-db2sc
    @YogeshPatil-db2sc 11 місяців тому

    Amazing ty

  • @shehab976
    @shehab976 2 роки тому +1

    Is that gonna work all the time?i have examples that has negative floats

    • @davidmclachlanproject
      @davidmclachlanproject  2 роки тому +1

      Good question. I've had a look at your video - love your program! Great stuff. For that, it is a normal PERT diagram with no ES or LS etc, you can just add up the shortest path (e.g. 1, 4, 7, 9). Using a schedule network diagram, you should have ES and LS, and I can't think of any situation where your late start would be BEFORE your early start (and hence, a negative number). Especially if doing the forward and backward pass first. I may be missing something?

    • @shehab976
      @shehab976 2 роки тому

      @@davidmclachlanproject sir,those were (ls,lf,es,ef) in the image too,u just need to increase the text size at top of the app,i updated the app several times,its no more exactly that one in the video...bt i am stuck finding critical path

  • @A-Sidhu
    @A-Sidhu 5 місяців тому +1

    Make the first activity day 0 instead of day 1. Then you don't need to add or subtract 1 later on.

    • @Lexyvil
      @Lexyvil 18 днів тому +1

      That's exactly what I've been doing in my own Schedule Network Diagram. I don't get why Early Finish has -1 applied to them in this video, when normally the Early Finish should be "Early Start + Duration".

  • @timmyhiggins5220
    @timmyhiggins5220 11 місяців тому +2

    I don't understand where he got 15..6 plus 10 equals 16

    • @chakekarabo1421
      @chakekarabo1421 6 місяців тому +1

      Same here because in my understanding it should be ES plus Duration to get EF

    • @adaoraobed608
      @adaoraobed608 5 місяців тому

      He is just not detailed.

  • @jud3356
    @jud3356 Рік тому

    The video seems to be broken? It’s not playing

  • @pushpanaorem4371
    @pushpanaorem4371 Рік тому +1

    you miss explaining certain thing. Please make sure u explain everything at least what u have displayed on the screen..forward and backward pass explanation is not clear

  • @agapeagapeone
    @agapeagapeone 2 роки тому

    🤣🤣🤣 4:29