CompleXity Index (CXI) is a method developed to help manufacturing companies to describe complexity as experienced and to assist in reducing the effects it has on operator performance. The method is targeting the perceived complexity and was tested at Volvo Cars Corporation. Reproducibility of the method could be seen between respondents and was considered a valuable tool for visualizing problem-areas at the stations. It is suggested that objective data could be one way to identify which stations should be tested in-depth with the CXI method, and that CXI could be used for suggesting improvements or appropriate support tools. © 2012 The Authors.