There are many different ways to measure a construct and the method chosen to accomplish this task can have a major effect on results of statistical analyses based on the measured variable. We looked at various methods ranging between naive and sophisticated that can be used to measure self-efficacy within the special context of mathematics, in order to investigate similarities and differences between measurement results. Our conclusion is that under specific situations basic and simple measurements of maths self-efficacy can be as effective as their mathematically elegant but complex counterparts.