“…We examined dimensionality via a series of parametric and non-parametric factor analytic methods, and reliability (including the relative difficulty and precision of writing individual letters) using Item Response Theory (IRT) analysis. Given prior research about differences in the acquisition of knowledge about letter names and letter sounds (e.g., Justice et al, 2006; McBride-Chang, 1999; Phillips et al, 2012; Piasta, Petscher, & Justice, 2012; Treiman & Kessler, 2003) and writing of lowercase letters with grade school (Graham et al, 2001; Lewis & Lewis, 1964, Newland, 1932; Pressey & Pressey, 1927) and uppercase letters with preschool (Worden & Boettcher, 1990) children, we expected to find a hierarchy of difficulty for letter writing. However, we did not have a specific hypothesis regarding a sequence because of lack of prior research.…”