This study examines the usefulness of an alternative supervision model for a group of in-service English Language Teachers (ELT) at the Postgraduate Diploma in Education (PGDE) programme at Bahrain Teachers College (BTC), University of Bahrain in developing those teachers' teaching practices during their teaching practicum. A two-cycle approach was implemented, providing two different types of written feedback, written comments and structured written reports during the supervision process. Using interviews and questionnaires, teacher candidates found written feedback very effective in assisting them develop specific teaching skills, namely reflection, rethinking evaluation, surrendering certainty, and acknowledging continual professional development. The study findings also revealed one major implication that is the influence of written feedback in reinforcing a participatory supervision between the university supervisor and teacher trainee in fostering relations of trust and confidence between both of them.