Pogledajte ove dve ref. gde se objašnjava šta su pass/no pass class.
http://www.wisegeek.com/what-is-a-passno-pass-class.htm
http://www.sbcc.edu/counselingcenter/counselingquestions/pas...

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Taking classes for Pass/No Pass means that you are requesting to receive credit for a course without receiving a letter grade (A, B, C, D, F). Therefore, as long as you earn the equivalent of an A, B, or C, you will earn a "Pass" for a grade of record. If you instead earn a D or F, you will receive a "No Pass" on your official transcript

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http://www.pdx.edu/registration/grading-system

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Undifferentiated (P/NP) Only
Pass Grades (P)
The grade of P is used to indicate successful completion (C- or better for undergraduate, B- or better for graduate) of a course. A grade of P carries credit but is not included when calculating G.P.A.

No-Pass Grades (NP)
The grade of NP is used to indicate unsatisfactory performance in a course. A grade of NP results in no credit earned and is not included when calculating G.P.A.

P/NP Option
Some courses are offered under both differentiated and undifferentiated grading options. The default grading option is A-F but students may choose the P/NP option instead.

Students may choose the P/NP option, if available, during the pre-term registration period and first seven weeks of a term.



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Note added at 16 hrs (2013-05-03 11:35:00 GMT)
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http://www.trinity.edu/departments/academic_affairs/hb/instr...

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IV. PASS/FAIL OPTION

Certain undergraduate courses may be taken on a pass/fail basis. Such courses may not be taken to fulfill Common Curriculum requirements or major or minor requirements. The purpose of the pass/fail system at Trinity University is to encourage students to take elective courses in new fields of interest. A student applying to take a course on a pass/fail basis may not subsequently request a regular letter grade, and a student registered for a regular course grade may not change to pass/fail after Add/Drop day. The last day to designate a course as pass/fail is the 15th day of classes.