The Geometry Assessments for Secondary Teachers (GAST) Classroom Observation Tool classifies the teaching moves and instructional tasks of teachers according to cognitive demand. It is designed for use specifically within math lessons focused on similarity, congruence, surface area, and volume. It can be used by teacher educators and researchers to identify the quality of math instruction within this domain.
Content
Domains
Subdomain
Topics
Classroom Instruction
Grades
8-12
Languages
English
Respondent
Observer
Administration information
Length
22 items to be rated across a full lesson.
Administration
Individual,
Observation
National Sample
No
Access and Use
Contact
Margaret Mohr-Schroeder, mmohr2@uky.edu
Psychometrics
Scoring
Manual scoring
Open Access
No
Resources on Psychometric Properties
Mohr-Schroeder, M., Ronau, R. N., Peters, S., Lee, C. W., & Bush, W. S. (2017). Predicting Student Achievement Using Measures of Teachers’ Knowledge for Teaching Geometry. Journal for Research in Mathematics Education, 48(5), 520–566.