A tale of two progressions: students’ learning progression of the particle nature of matter and teachers’ perception on the progression

Disciplinary and Interdisciplinary Science Education Research

Table 7 The statistics on the basis of teachers’ judgments (grouped by teaching experience)

Judgment basis	All teachers	Responses by groups of teachers
Judgment basis	All teachers	1–10 years of teaching experience	11–20 years of teaching experience	21 + years of teaching experience
A. Guess	16.7%	29.2%	6.7%	16.7%
B. Literature	0.0%	0.0%	0.0%	0.0%
C. Teaching experience	83.3%	70.8%	93.3%	83.3%
D. Others	0.0%	0.0%	0.0%	0.0%