Jan-David Freund is research assistant and doctoral candidate at Otto-Friedrich University of Bamberg. Since November 2012 he works at the DFG funded project ViVA (Video-Based Validity Analyses of Measures of Early Childhood Competencies and Home Learning Environment). He graduated as Diplom Psychologe Univ. in October 2012 (graded sehr gut, best). In his diploma thesis he developed and evaluated a test instrument for the measurement of numerical competencies in early childhood. From June to October 2012 he worked as research assistant in stage 1 “From Birth to Early Child Care” of the National Educational Panel Study. His main research interests are in the fields of early childhood research, development and assessment of competencies, longitudinal studies and psychological diagnostics in general.