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Equivalence can have two basic approaches: the equivalent units have the same connection pattern to the same neighbors or these units have same or similar connection pattern to different neighbors. If the units are connected to the rest of network in identical ways, then they are structurally equivalent.<ref name="mrvar.fdv.uni-lj.si"/> Units can also be regularly equivalent, when they are equivalently connected to equivalent others.<ref name="Examples, 1999, pp. 5–34"/>
With blockmodeling, it is necessary to consider the issue of results being affected by measurement errors in the initial stage of acquiring the data.<ref name="Absent Ties in Social Networks, the">{{cite journal |last1=Žnidaršič |first1=Anja |last2=Doreian |first2=Patrick |last3=Ferligoj |first3=Anuška |date=2012 |title=Absent Ties in Social Networks, their Treatments, and Blockmodeling Outcomes |url= |journal=Metodološki zvezki |volume=9 |issue=2 |pages=119–138 |doi=}}</ref> Blockmodeling was at first used in analysis in [[sociometry]] and [[psychometry]], but has now spread also to other sciences.<ref>[https://www.iioa.org/conferences/16th/files/Papers/Weber%20Introducing%20blockmodeling%20to%20input-output%20analysis.doc WEBER, M. (2007), “Introducing blockmodeling to input-output analysis”. 16th International I-Ot Conf, Istanbul, Turkey.]</ref>
== Different approaches ==
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