“…Although it is possible to base criteria on the acquisition of linguistic forms and structures, sociolinguistic units, or features of text and discourse, it has been more typical to base them on global dimensions of L2 proficiency or on skills for reading, writing, listening, and speaking. Surveys by Pica (1997) and Pica, Washburn, Evans, and Jo (1998) have identified this pattern across a range of approaches to L2 content integration, including immersion (Genesee, Polich, & Stanley, 1977;Hart & Lapkin, 1989;Ho, 1982;Sternfeld, 1988;Swain, 1991;Wesche, 1992); sheltered (Freeman, Freeman, & Gonzalez, 1987;Hauptman, Wesche, & Ready, 1988;Lafayette & Buscaglia, 1985;Sternfeld 1989;and Wesche, 1985); adjunct (Brinton, Snow, & Wesche, 1989;Snow & Brinton, 1988); themebased (Giauque, 1987;Leaver & Stryker, 1989); and LSP (Graham & Beardsley, 1986;Hudson, 1991;Peck, 1987).…”