This chapter reports on the solutions of 22 groups of Year 10 students (15–16 years old) to a model-eliciting activity involving interpretation of data, namely, lists of salaries from five companies. Students were asked to see what could be ascertained about the structure of the company based on their mathematical or statistical analysis of the data. The students had no previous modelling experience but some understanding of statistics. Solutions based on the concepts and the processes involved in the models are represented in a graph. This analysis tool allowed distinguishing of significant differences between students’ responses. Results show a wide range of concepts and mathematical procedures were used. The activity promoted mathematical modelling and could be the first of a didactic sequence aimed at working on data distribution and dispersion.