When first studying children's artistic development, many preservice teachers feel amazed as they learn students' artistic capabilities and see how students can thrive under the guidance of effective art educators. Teaching a standards-based art curriculum skillfully and with care requires art educators to be familiar with developmentally appropriate media, processes, subject matter, and assessments. Art educators must also consider children's individual capabilities and personal interests, as all students are unique. To begin their journey in planning developmentally appropriate curricular tasks and assessments, Debrah Siclkler-Voight introduced preservice teachers to international children's artworks that span early childhood through adolescence and had them study diverse development theories (Duncum, 1997; Fineberg, 2006; Kindler, 2004, 2010; Kindler & Darras, 1997; Lowenfeld, 1947; Sickler-Voigt, 2020; B. Wilson, 2004; M. Wilson & B. Wilson, 2010). By examining children's artworks in conjunction with development theories, they could identify what developmentally appropriate children's artwork is and how learning outcomes can be influenced by students' cognitive, physical, and social/emotional development (College Board, 2012). This White Paper provides examples of how preservice art educators utilized journals to assess children's artistic development. Working with journals encouraged the preservice art educators to process the online resources on children's artistic development and make personal connections to educational theories, seek data from diverse sources, and retain and apply what they have learned (Sickler-Voigt, 2007). Such practices offer art educators the necessary skills to implement curricular possibilities that foster student creative productions based on their full artistic, cognitive, physical, and social/emotional abilities. Assessment White Papers for Art Education is a collection of essays that teach about current and established assessment practices and theories, and how they are relevant to all of the National Art Education Association's (NAEA) membership. This series offers a starting point for NAEA members--across all levels--as well as parents, administrators, and the general public to understand assessments' applications to art education.