The aim of this study is to employ the Pirie-Kieren model so as to examine the understandings relating to the domain of multivariable functions held by primary school mathematics preservice teachers. The data obtained was categorized according to Pirie-Kieren model and demonstrated visually in tables and bar charts. The study group consisted of forty sophomore primary school mathematics preservice teachers during the process of their education at a state university in Turkey. The data were collected via a test consisting of open-ended questions prepared by the researchers of the study. The findings demonstrated that preservice teachers submitted answers predominantly at the "property noticing" stage as defined by the Pirie-Kieren model. In addition, answers by participants were also encountered within the "image making" and "image having" stages of the model.