This study explores school principals' practices in carrying out the performance appraisal of teachers in Omani Basic Education schools. Selection of participants is critical in qualitative research; therefore, the researcher used purposeful sampling to identify the three Omani public school levels. Standardized open-ended interview approach is used as the primary source of data, direct observations and document analysis. The themes that presented in this article are, setting performance goals through the school plan, monitoring teachers' performance through class observations, giving instructions and advice as feedback and developing teacher's performance through workshops and paper presentation.