Table 2.

Individual item loadings for the 3 factor EFA

	Disciplinary literacy items	Factor I	Factor II	Factor III	Keep
		Source literacy	Analytic literacy	Expressive literacy
1.	When writing, how often do you revise for credibility of other authors’ claims?	0.79	0.00	0.04	●
2.	When evaluating author’s claims, how often do you verify the author’s claims with other authors’ claims?	0.74	− 0.04	0.05	●
3.	When synthesizing information, how often do you require corroborating evidences from multiple authors?	0.69	0.04	− 0.02	●
4.	When evaluating author’s claims, how often do you consider the author’s institutional affiliation?	0.62	− 0.07	− 0.04	●
5.	When writing, how often do you revise for validity and replicability?	0.53	0.32	− 0.02	●
6.	While reading, how often do you analyze quantitative terminology?	− 0.02	0.72	0.11	●
7.	While reading, how often do you analyze technical terminology?	− 0.02	0.67	0.13	●
8.	When reading how often do you analyze graphs?	0.05	0.63	− 0.29	●
9.	When synthesizing information, how often do you interpret data to support a model or hypothesis?	0.23	0.52	− 0.11	●
10.	How often do you organize curricular material by escalating logic?	− 0.05	0.49	0.01	●
11.	When synthesizing information, how often do you aim for convergence upon a solution?	0.11	0.47	0.01	●
12.	How often do you organize curricular material by progression of topics?	− 0.07	0.46	− 0.03	●
13.	While reading, how often do you deconstruct figurative language?	− 0.11	0.09	0.85	●
14.	When reading, how often do you analyze a text’s rhetorical devices?	0.12	0.00	0.69	●
15.	When evaluating author’s claims, how often do you differentiate the speaker from the author?	0.31	− 0.18	0.60	●
16.	When writing, how often do you revise for style and voice?	0.39	− 0.11	0.46	●
17.	While reading, how often do you analyze source information?	0.29	0.21	0.37	○
18.	How often do you organize curricular material by themes?	0.14	0.12	0.20	○
19.	How often do you organize curricular material by chronological progression?	0.01	0.17	0.20	○
20.	When reading, how often do you analyze photographs as source information?	0.37	0.21	0.10	○
21.	When writing, how often do you revise for precision and accuracy?	0.44	0.26	0.08	○
22.	When reading, how often do you analyze symbolic notation?	0.02	0.41	0.21	○
23.	When evaluating author’s claims, how often do you consider information about the author inconsequential?	− 0.02	0.10	− 0.02	○
24.	When synthesizing information, how often do you include personal experiences as evidence?	0.01	0.15	0.26	○