The objective of this research was to investigate the quality criteria to be met to design a Learning Object (LO); it was intended to contribute to the professional development of English language teachers. The study was of an exploratory orientation, and the LO was evaluated and validated by thirteen experts: five in pedagogy, two in computer technology, one in media evaluation, three in graphic design and two English teacher trainers. Furthermore, English language teachers were acknowledged as potential users and eight professionals were asked to use and assess the LO. The data was gathered using a questionnaire that was auto-administered (SurveyMonkey) using a Likert type scale. The findings, which incorporate aspects of technology, pedagogy and design or format, revealed the diverse aspects that determined the quality of the LO.