An illuminative evaluation of the impact of two-tier diagnostic instruments on undergraduate chemistry teachers' alternative conceptions

Tiered diagnostic tools enable learners’ conceptual challenges to be unearthed. They have been used in recent times to facilitate better teaching and learning strategies to offset identified teaching and learning barriers. This study illuminatively evaluated the impact of two-tier tools in diagnosing the conceptual problems of 118 undergraduate teacher trainees. The results were interpreted within an epistemological framework. The outcome of the review was that tiered diagnostic instruments, though difficult to construct, were effective in unveiling learners’ conceptual challenges in inorganic chemistry. As many as 19 alternative conceptions were unearthed for three topics in six semesters, which otherwise would have been lost on the teacher trainees and their lecturers. These findings would contribute towards the chemistry learning community and add up to existing knowledge.