Wednesday, 7 October 2015

BSI BIM Conference – BIM Toolkit – Post 2 of 3 – Levels of Definition

Following a six week prototyping phase, a six month funded development phase and then five months of industry testing and further enhancements it was really good to be able to remove the ‘beta’ logo from the homepage of the BIM Toolkit in time for the 2015 BSI BIM Conference this year.

The removal of the ‘beta’ logo doesn't mean that the toolkit journey is at an end - but it is a sign that all of the functionality is working correctly and that it is ‘release quality’.

At the BSI BIM conference I presented three of the main concepts behind the BIM Toolkit: Classification; Levels of Definition and Digital Plans of Work. I have written three short blog posts to go through these slides as an introduction to these. This second blog post is on levels of definition.

At the conference, I attempted to work through an analogy reflecting on how content for an event was developed. Three months before the conference the speakers would provide a description of their presentations. Two months before the conference they’d provide an outline of the proposed slide sequences. Nearing the conference date a final draft would be provided and then the actual presentation would be published as a record.
The incremental stages of putting together a presentation
This process provides just the right amount of information at the right time. It allows the client (the conference organiser) to have confidence that the content is progressing and to sell the event. It allows the team of speakers to share their intentions and align their messages. It is not onerous in terms of the demand for too much information too soon.

These principles apply also to the construction industry. These levels of definition can be split into ‘level of detail’ which relates to the geometric detail and ‘level of information’ which defines the information related to the model. The slides below illustrate this:
Technical Article from Alistair Kell BDP and Stefan Mordue NBS
Expected geometric development for building fabric and services examples
Expected information development for building fabric and services examples
Example LOD-2 illustration for a tunnel lining system
Example LOD-5 illustration for a tunnel lining system
Example LOI-3 illustration for a tunnel lining system
As part of the BIM Toolkit so far we have published around 500 sets of LOD illustrations and 5,700 sets of specific LOI definitions (and associated Microsoft Excel templates). All LOI information is available for free in a documented software API.

Summary slide
Further information:

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