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Item Response Theory becomes one of the most popular methods for instruments development and evaluation methods. This baseline study is a self-directed learning readiness (SDLR) 40 item scale with data from 648 undergraduate psychology female students attending Qassim University in Saudi Arabia through randomized selection to evaluate an SDLR scale at item and scale levels using GRM. Results provide more detailed diagnostic information to modulate the scale. GRM analysis led to the detection of two locally dependent items, one item with low discrimination parameter and 15 model misfit items. The scale often tends to measure low and moderate levels of SDLR. Advanced psychometric evaluations should be made and the SDLR scale must be reviewed based on quantitative and qualitative analysis.

Using Item Response Theory to Evaluate Self-directed Learning Readiness Scale