# Definition of the level for the IfcBuildingStorey (opinion poll)

**URL:** <https://forums.buildingsmart.org/t/definition-of-the-level-for-the-ifcbuildingstorey-opinion-poll/404>\
**Category:** IFC\
**Tags:** ifc4\
**Created:** [October 20, 2018, 8:29pm UTC](https://forums.buildingsmart.org/t/definition-of-the-level-for-the-ifcbuildingstorey-opinion-poll/404 "2018-10-20T20:29:12Z")\
**Posts on this page:** 1\
**Showing post:** 21

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**Author:** ![agron](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.buildingsmart.org/agron/32/1158_2.png) [@agron](https://forums.buildingsmart.org/u/agron)\
**Post date:** [December 4, 2018, 9:20pm UTC](https://forums.buildingsmart.org/t/definition-of-the-level-for-the-ifcbuildingstorey-opinion-poll/404/21 "2018-12-04T21:20:08Z")

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Hello Everyone!

To clarify the question of where the IfcBuildingStorey should be in best practice located, I will continue this topic here and focus on some feedback from the participants. Therefore I have prepared a poll for all interested to take part.

The question is simple:

Depending with which stage of the building life cycle you are dealing with, what is the best scenario for YOU to develop/communicate your models concerning the level of each storey.

 ![ifcstorey](https://us1.discourse-cdn.com/flex016/uploads/buildingsmart1/original/1X/ff33fd08eadec145dcb32f73c29eabe0a035b6f5.jpeg)

First case: the IfcBuidlingStorey is located at the SSL.

Second case: the IfcBuildingStorey is located at the FFL.

The voting is visible, and you are allowed multiple choices (max 5). Why that? Because some participants might cover various tasks, from design into construction phase. But if you cover just one aspect of this topic, please vote JUST ONE. Therefore, please reflect on the topic and choose the best option/s for your use case. Since I did not have the possibility to create a poll with rows and columns, I must present each use case as a separate row.

If you believe you have another use case, which has not been listed in this voting, please choose “other FFL or SSL” and be so kind to leave a comment with a short description of you case.

_Poll ([view on site](https://forums.buildingsmart.org/t/definition-of-the-level-for-the-ifcbuildingstorey-opinion-poll/404/21))_

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_[View the full topic](https://forums.buildingsmart.org/t/definition-of-the-level-for-the-ifcbuildingstorey-opinion-poll/404)._