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Thread: Reviewing existing schedules

  1. #1

    Reviewing existing schedules

    Reviewing an existing schedule might sound more complicated than creating a schedule from scratch, but it actually should not be the case.
    The first thing you must check is the existing links. You can’t believe how often I saw schedules that didn’t have enough links and activities just floating around. This is equal to not utilizing the schedule program or logic at all and writing everything on a piece of paper.

    In order to establish a critical path, a logical and complete set of links are vital. Not only they must represent the logic of schedule, they must be complete in order to prevent any activities just floating around.

    After that a lot of sanity checks should be done. For example, if the painting starts before drywall there is a serious error somewhere. Just look at the major items one by one, and compare their dates to each other. If something doesn’t make sense, then check the links.

    another thing to check is, sometimes they give a more than 0% completion, but they also show a finish date which is past. this can not happen. similarly, sometimes they show 0% progress but start date of past. this also can not happen. both cases mean that they didnt update their data date and the remaining duration in that activity is not continuting after today which should be the case (remaining work can only happen after now, not in the past)

    sometimes there are items in the schedule which do not belong in the work scope. these should be eliminated. for example, last week i was reviewing a schedule and the contractor put in sevral items belonging to an "abatement and demolition" scope, which should not have been there, because it belonged to another phase of the project. Naturally, he could not even tie them to any activity afterwards. Another example of non scope items may be the fabrication of materials, submittals, getting a certain issue resolved etc... Now I am not saying that these can not be in the schedule, because for informational purposes they can, but if it is not part of scope, then do not put it in, it is not good practice. It distorts the percentage completion for instance, as it adds to the overall amount of work needed to be done for building a project, where actually they were not part of the work but just some prerequisities. They should be tracked differently.
    Disclaimer: The information in my or other's posts on this website is not legal advice and you need to confirm the accuracy of any information before using it. See forum rules for terms of use (it is the first thread at the top under "General Discussion" category.)

  2. #2
    Lets not forget the effect of delays induced by weather nad unforessen conditions

  3. #3
    a schedule has to take care of an item such as curing time of concrete but it may either be inserted as a lag or by increasing the concrete activity duration. i agree that it should not be a separate activity because it is not a separate scope item

  4. #4
    do not forget to place the rebar duration within the concrete duration unless you have broken down all activities for concrete separately. if it is not done, it must be highlighted during schedule review.

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