Abstract
Purpose This study investigated the role of experienced practitioners in promoting pre-service teachers' knowledge construction and social interaction in an online professional learning community. Design/methodology/approach A repeated measures design with control and experimental groups was adopted. Two practitioners supported pre-service teachers in the experimental group to discuss issues around teaching practice. Social network analysis (SNA) and content analysis (CA) were used in the analytical approach. Findings CA revealed that the practitioners increased pre-service teachers' levels of knowledge construction and high-cognitive discourse. SNA showed that the practitioners enhanced pre-service teachers' professional ties. Though collaboration in high-level knowledge building occurred predominantly in peers in the same discipline, the presence of the practitioners facilitated the development of more cross-disciplinary ties in the experimental group. Originality/value The study contributes new knowledge about the ways in which practitioners can enhance the collaboration among pre-service teachers in an online PLC. It also provides insight on how to combine CA and SNA, to examine professional learning.