“…Based on validity-index values, response patterns can be classified as either “normal” or “suspect”, the latter meaning that the resulting test score is likely to be invalid. Recent research has shown the usefulness of validity indices for detecting nonoptimal response strategies (e.g., acquiescence response bias) and inconsistent or repetitive responding in survey data (e.g., Conijn, van der Ark, & Spinhoven, 2020; Meade & Craig, 2012; Niessen et al, 2016). These indices can also be expected to detect young children’s aberrant response behaviors, as research has shown that young children may produce inconsistent or repetitive response patterns due to various factors: limited cognitive ability and memory skills, limited attention span (Eddy et al, 2011; Eiser, Mohay, & Morse, 2000; Reeve et al, 2017), response biases in using rating scales such as choosing the extremes (Chambers & Johnston, 2002; Davis et al, 2007), and displaying nondifferentiation among items that assess opposite constructs (Shelton et al, 1996).…”