This paper describes the rationale behind the concrete steps how we systematically have gone through the case selection process as the first phase of a research project named Consequences of the Digitalization of Schools. The project is a single-case longitudinal (5-year long) study and adopts a so called Whole-School Approach. Previous research has criticized case studies for lack of both systematic approach and transparency in the presentation of the case selection process. The purpose of the presentation of this case selection process is to contribute to enhancing understanding of and broadening knowledge on systematic and transparent case selection techniques. The SIRIS database has been used to select a typical Swedish primary school in the chosen municipality where the project will be conducted. The SIRIS database contains annually statistics from all primary schools in Sweden, and is available online for public use. We demonstrate how and why a particular school representing a so called typical school was selected as our case.