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The ISLPR is a Likert-type scale from 0 to 5 (low to high abilities) with plus ratings (0, 1, 1+, 2, 2+, 3, 3+, 4, 4+, 5).
Although conversational Spanish proficiency was not formally assessed through paper-and-pencil tests, the bilingual facilitator assessed this ability through use of the ISLPR and noted the students' language abilities as being balanced and proficiently bilingual.
This is also valuable, as a rich pool of experience is available in (their) related research studies and projects, extensive work in the ISLPR (International Second Language Proficiency Ratings) and national investigations.