{{UMM|Managing the control relation in the metamodel requires to introduce a relation block „CONTROL“ with two metaproperties „Armature#“ and „Pump#“.}}
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Lets have a closer look at the characteristics of the two methods relating objects:
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<td align="center"><b>Cardinality 1 : n</b></td>
<td align="center"><b>Cardinality n : n</b></td>
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<div style="padding: 5px; border: 1px solid black; background-color: #B7DEE8;">;UBIK metamodel: {{UMM|Data model built and described by metaclasses and metaproperties related to each other, either by <b>1 : n</b> or <b>n : n</b> cardinality.</div>}}
===Entity Relationship Model (ER model)===