Table 3.

Revision of the lesson series after the first evaluation phase

Issues identified in expert review	Adaptation in second design phase
•   Differences in teachers’ expertise regarding historical thinking •   Difficulty level for students •   Insufficient supporting materials for teachers and students •   Reliance on textual sources	Teacher materials •   Explanatory texts on second-order and procedural knowledge •   Suggestions for coaching students •   Additional scaffolds for students Student materials •   Development of a learning text •   Development of worksheets •   Development of additional scaffolds •   Addition of visual sources
Issues identified in the pilot study of the evaluation rubric	Adaptation in second design phase
•   Criteria not clearly delineated •   Ambiguity in descriptions of proficiency levels •   Complex to use	•   Merging and addition of criteria •   Revision of descriptors •   Development of a user guide with exemplary essays