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Defining requirements for systems and elements

For each technical object (a system or spatial element: see here for an introduction), it is possible to formulate requirements on the detail view. The detail view features a number of tables where you can fill in/select different kinds of requirements. Below we will go through each of the tables.

Please note that you can the hide blocks that you are not (yet) interested in. To do so, just click on the icon in front of the block’s name.

Collapse or expand tables by clicking on the icon

Don’t forget to check out our 5 min video on how to define requirements for systems and elements.


This is the place to enter a general description of a system or spatial element, explaining its general purpose or function.

Example of a description of a cold-water service system, which describes its general purpose/function.

Please note: it is not always useful or necessary to add an description. Specific technical solutions, however, can benefit from a description. The same is true for systems or elements that are referred to by an abbreviation.


Labels are not requirements, but rather tags or categorizations that you can add to objects. You can create them but just starting to type in the label field.

For example, in a renovation project, you may wish to label systems as existing or new.

Read more about working with labels here.


Classifications and numberings can be used to identify and categorize the systems and elements in your model, e.g. a classification according to Uniclass, OmniClass, CCS or SfB.

More about classifications and numberings can be read here.

(Optional) standard properties

Standard properties can be defined via the standard properties settings and they apply to all objects of the same type in that tree (in this case all elements or all systems). Relevant properties may be characteristics such as warranty or technical condition.

However, because of diversity of objects in the systems and elements tree (e.g. ranging from water taps and office partitions to CCTV systems and PV-panels), the usefulness of standard properties tends to be limited.

More relevant are optional standard properties. Optional standard properties are like normal standard properties, but they can be linked (as a block) to specific objects.

Read more about optional standard property blocks here.

Optional standard property blocks can be linked to an object’s detail view via the icon in the upper right corner of the detail view.

Custom properties

The table Properties is the spot where you add custom properties concerning the system’s or element’s qualities.

Properties can cover anything from performance, capacity, flexibility, material or warranty periods. Below there is an example of the properties of a cold-water service system.

If you have a list of properties, you can also insert a property between two existing ones by clicking on the icon that appears when you hoover with your mouse near the starting point of the table’s separation lines.


The table Placement allows you to link systems and elements to the spatial break down structure, indicating where they need to be placed. In this it is important to note the following:

  • Systems can be linked the building or civil structure as whole, or to space groups.
  • Spatial elements can be linked to specific spaces (buildings) or specific segments (infrastructure projects)

The reason for this difference is that systems are overall functions (e.g. a HVAC system), with lots of parts, that cannot be linked to a particular space. In contrast, spatial elements are tangible, typically countable items (e.g. a power socket) that have a distinct location in a room or space.

To link a system or element, you have to click Select, you will be able to choose locations to add from the space tree.

In the case of spatial elements, you can also add a quantity to the location relation.

Example of a placement table of a water tap which has to be placed in two Kitchenette spaces.


The interfaces with other systems / elements table allows you to define an interface relationship or link between one system or element and another.

In a building project, you may for example want to specify that the CCTV system should be connected to the building management system (BMS) or the UPS system.

Once you click on Select, you will be able to choose systems or elements to link to from the systems & elements tree. You can add notes if necessary to further specify or explain the requested interface.

Notes will show in the exact same manner on the detail views of the related objects, no matter the direction of the interface relation. So notes should be formulated in such a way that they can be understood from both directions.

You can also access a visual representation of the interfaces you have defined for your project by using the interfaces diagram or by making a cross table (which will give you an interface matrix)


The last table on the detail page is the one for Uploads. This table will allow you to upload files you feel are relevant for this particular system or element.

Uploads can be things like cable diagrams to installation guidelines or specific parts of a standard. Be careful, however, not to ‘hide’ any requirements in these files.

Once you click Upload File, you will be able to choose from any file on the device you are currently on. Upload the file of your choice and add notes if necessary (e.g. reference to a particular page or chapter).

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