Geometry Assessments for Secondary Teachers (GAST) Classroom Observation Tool

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.