Documentation plays an important role in the organization of Swedish preschool provision. The collection and interpretation of documentation is typically expected to be conducted by preschool teachers. In the Reggio Emilia-inspired preschools, however, documentation which is termed as pedagogical documentation, is produced both by preschool teachers and atelieristas. Working with an atelierista for a project while creating the pedagogical documentation is an important component to build knowledge, which will provide an artistic and aesthetic perspective to the preschool teacher and the children. The aim of this study is to explore the unique contribution of the atelierista to pedagogical documentation practices in the Reggio Emilia-inspired Swedish preschools. In particular, this study focused on how and why collaborative work between the atelierista and the preschool teacher influences the pedagogical documentation. The data is gathered trought on semi-structured interviews with atelieristas and preschool teachers in two Reggio Emilia-inspired preschools in Sweden. The major question addressed is: What are the differences and similarities between the atelierista and the preschool teacher while producing the pedagogical documentation in the Reggio Emilia-inspired Swedish preschools? The findings showed that during the interviews the themes of the similarities are reported by the participants as, 1) ‘being equally responsible’ and 2) ‘working collaboratively’ for the purpose of making the learning process visible and the themes of the diffferences are reported as, 1) ‘utilizing the background differences’. Moreover, the findings reveal the importance of the atelierista’s role during the pedagogical documentation process through equally responsible collaborative work with the preschool teacher in a mutually trusting learning environment.