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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

Category
Schooling
Sub-Category
Teaching
Domains
Classroom Instruction
Grades
8th Grade,
9th Grade,
10th Grade,
11th Grade,
12th Grade
Languages
English
Respondent
Observer

Administration Information

Length
22 items to be rated across a full lesson.

Access and Use

Contact

Margaret Mohr-Schroeder, mmohr2@uky.edu

Open Access
No

Psychometrics

Scoring
Manual scoring
Psychometric References

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. https://doi.org/10.5951/jresematheduc.48.5.0520

Psychometric Considerations

Psychometrics is the science of psychological assessment. A primary goal of EdInstruments is to provide information on crucial psychometric topics including Validity and Reliability – essential concepts of evaluation, which indicate how well an instrument measures a construct - as well as additional properties that are worthy of consideration when selecting an instrument of measurement.

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