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Thread: Level of Development Specification

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    Member Cyus's Avatar
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    Level of Development Specification

    I've been looking through BIMForum's LOD Specification which is a pretty comprehensive document, and wondered if anyone had used it, or if other systems are being used to define LOD.

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    Moderator snowyweston's Avatar
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    Link? I've pretty much stopped reading these kind of things.

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    Member Cyus's Avatar
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    Forum Co-Founder Twiceroadsfool's Avatar
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    Itll never get used here, as the one we wrote in house makes more sense and is more justifiable. The AGC one is better than a lot of the other ones that ive seen, but ultimately we will still use our own from in house.

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    Member Alfienoakes's Avatar
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    Just to jump in on this one. I see that a couple of you don't use the standard ones, assuming you have created your own. I am looking at ways of issuing our BIM's, and making sure that we limit our liability of interpretation, ie someone using part of the model for something it's not yet designed for.

    I prefer to use the very standard LOD number system, ie walls are at 300, but windows and doors are at 200. I have 2 questions on this.

    1. How are you guys dealing with issuing that information with the model, ie the LOD's elements are at. Do you include a covering email, embed it in the model somehow.?

    2. Do you think the document listed above in this thread is a little bit of overkill.? Is there a better document that should be used?

    Many thanks

    Andy

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    Moderator Drew's Avatar
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    Quote Originally Posted by Alfienoakes View Post
    Just to jump in on this one. I see that a couple of you don't use the standard ones, assuming you have created your own. I am looking at ways of issuing our BIM's, and making sure that we limit our liability of interpretation, ie someone using part of the model for something it's not yet designed for.

    I prefer to use the very standard LOD number system, ie walls are at 300, but windows and doors are at 200. I have 2 questions on this.

    1. How are you guys dealing with issuing that information with the model, ie the LOD's elements are at. Do you include a covering email, embed it in the model somehow.?

    2. Do you think the document listed above in this thread is a little bit of overkill.? Is there a better document that should be used?

    Many thanks

    Andy
    IMHO, typically if you are in the position of issuing models you would more than likely have a BEP in place. We have a LOD matrix in our BEP listing pretty much as many elements as we can with the required LOD for those elements. This way when issuing the model you simply refer to the BEP for LOD. It's great for the entire project team to understand what is expected from all other parties.

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    Member Alfienoakes's Avatar
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    Quote Originally Posted by Drew View Post
    IMHO, typically if you are in the position of issuing models you would more than likely have a BEP in place. We have a LOD matrix in our BEP listing pretty much as many elements as we can with the required LOD for those elements. This way when issuing the model you simply refer to the BEP for LOD. It's great for the entire project team to understand what is expected from all other parties.
    Yep agreed. But, when you issue the model, how do you convey what LOD the elements are within that model, especially if it's not a standard "stage" issue..? If I'm issuing at stage d, that would infer that the model will have X element at various LOD's.

    I just wondered what people did if the stage issue had moved on past one stage, but not quite to the next. Sometimes you could bring elements up to the next level, to perhaps aid a certain process. How would you relay these various LOD's within the model...? We are sometimes issuing models on a weekly basis, with the contractor expecting progress within each issue.

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    Moderator Drew's Avatar
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    Yeah, I see you question now.... I guess we have never really had to worry too much about it as we provide LOD300 from the earliest stages through to cd's. The only LOD100/200 items would be NIC items which only really needs to indicate a basic size.
    Granted,it probably shows a little too much info for schematic design but it removes the issue of having to upgrade during the documentation period.

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    Member Alfienoakes's Avatar
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    Its almost like you need a properties dialogue box for the whole model, that lists out the major elements and what their current LOD is.. Fraught with problems though Im sure, as its hard enough to get people to add the correct door numbers to doors, let alone fill in LOD's..

    I suppose then, the way to go is as you state; we issue models with a minimum LOD for a certain stage, that then just moves up through the "official" stages of development.

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