A behavior analyst is conducting research on the accuracy of a student’s responding to written math problems based on the final answer with no scoring of intermediate calculations. Which is the BEST method for obtaining accurate inter-observer agreement results?

A behavior analyst is conducting research on the accuracy of a student’s responding to written math problems based on the final answer with no scoring of intermediate calculations. Which is the BEST method for obtaining accurate inter-observer agreement results?
A .  Researcher and observer sit together to score the student’s work.
B .  Photocopies of the student’s work are scored independently by researcher and observer.
C .  The student’s scratch paper is scored if researcher and observer do not agree on a response.
D .  Researcher scores the student’s work and the observer reviews the researcher’s scores for accuracy.

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Answer: B