Table 1.

Sequence of CLASS-Bio statement development

1.	Examined CLASS-Phys and -Chem for statements that could apply to CLASS-Bio
2.	Met with faculty working groups to determine which statements should be included on CLASS-Bio
3.	Interviewed students and made modifications to statements based on their responses
4.	Solicited expert opinions and responses to statements
5.	Gave pilot version of CLASS-Bio (Fall 2007) and performed factor analysis following procedures listed in Table 2 (from Adams et al., 2006)
6.	Revised statements and solicited more feedback from faculty working groups, student interviews, and experts
7.	Administered final version of CLASS-Bio (Fall 2008) and performed a second independent factor analysis (again following all procedures in Table 2)
8.	Verified category robustness using a polychoric correlation matrix–based factor analysis (see text for details)