This report summarizes the classroom events associated with the implementation of trial mathematics curriculum materials at five community schools in Papua New Guinea. The field-notes prepared by classroom observers during the study of the Indigenous Mathematics Project formed the data base. Lessons implemented in at least four of the five sites were selected for summarization: 12 lessons in grade 2, 13 in grade 4, and 14 in grade 6, out of a total of 82 lessons implemented. Questions, problems, and suggested solutions are listed for each lesson, with the source site designated. Conclusions and recommendations are offered in the final section. Explicit comments on classroom management are given in relation to materials management, activity books, lesson organization, classroom atmosphere, and evaluating student progress. In regard to instructional materials, comments are included on teacher's notes, background notes, lesson introduction, answers, alternative materials, review lessons, and a teacher in-service course. A comment on the value of in-service training concludes the report. (MNS)