The aim is to describe and discuss documentation and assessment practices in Swedish preschools from a didaktik perspective. What different forms of documentation and assessment are found in the preschools? Preschools in both urban and rural municipalities are included in the selection. Document and textual analysis are used. A varied multi-documentation emerge. The multi-documentation at each preschool expose that preschool teachers seem to switch between different forms of documentation and assessment, including summative, formative and other assessments. The concept of transformative assessment may capture the different assessments interwoven in the multi-documentation. Transformative assessment is a concept focusing on reshaping and interplaying assessments that are intertwined in the registration and complex documentation at different levels and directions.