It was a Likert type scale questionnaire designed to measure a degree to which learners perceive themselves as having the skills and attitudes concerning the term “self-directed learning.” The scale was structured with a 5-point scale for responses, ranging from almost always true to almost never true. The inventory was submitted to evaluate by 3 experts who have more than 5 years of experience in teaching English for establishing validity. Evidence of reliability for the SDLRS was recently reviewed and summarized. The reported reliability data for internal consistency were split-half and coefficient alpha between 0.957 and 0.974.