This paper reports about professional learning related to mathematics instruction in student-teaching triads. The study focuses on how the joint work of triads offers opportunities for the professional learning of student teachers (interns), mentor teachers, and supervisors. Two elementary student-teaching triads reported different areas of and opportunities for professional learning related to mathematics instruction, with more areas and richer opportunities reported by the triad with more extensive collaboration among its members. Findings suggest the need for professional development activities in which mentors and supervisors can examine their stances toward joint work and professional learning in triads.

中文翻译：

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专业学习数学教学的机会：联合作业在学生三合会中的作用

本文报道了与学生教学三合会中的数学教学有关的专业学习。这项研究着重于三合会的联合工作如何为学生教师（实习生），导师教师和主管的专业学习提供机会。两个小学学生三合会报告了与数学教学有关的不同领域和专业学习机会，三合会报告了更多领域和更丰富的机会，其成员之间开展了更广泛的合作。调查结果表明需要开展专业发展活动，在这种活动中，导师和主管可以检查他们对三人制的共同工作和专业学习的立场。