The study was designed to explore certain determinants of instructor effectiveness regarding blended learning. A sample of five hundred students of Allama Iqbal Open University, Islamabad participated in the study. The researcher developed a questionnaire to seek the perceptions of the students on certain competencies/skills for better classroom management besides their good personal traits. . The collected data was entered into SPSS and the results were found using descriptive statistics. The results showed that the instructors must be enriched with good ‘personality traits’ for face to face interaction with the students. Next for web based online learning, creating a data driven environment was highly ranked followed by setting higher expectations, teaching meta cognitive & self regulation skills, planning off line activities, making learning relevant & interesting, encouraging online discussion, providing positive feedback to students and celebrating success. On the basis of findings, some potent recommendations were made to see the instructors more effective in this regard.