Pass/Non-Pass Option ( University regulations https://catalog.purdue.edu/content.php?catoid=15&navoid=18634#c-pass-not-pass-option)

In order to provide students with the opportunity to broaden their educational foundations with minimum concern for grades, an alternative grading system, the pass/not-pass option, is established. Students will register for the pass/not-pass option in accordance with "Academic Regulations and Procedures: Registration and Course Assignment," section A (University Senate Document 73-6, January 28, 1974).

1. The option is open to all students in the University subject to the regulations of the school in which the student is enrolled. In particular, the school will specify under what conditions a course that is passed under this option may be used to satisfy its graduation requirements. A department or school may specify that certain courses intended only for students in that department or school are available only on the pass/not-pass option (University Senate Document 75-10, as amended and approved, April 19, 1976).

2. Subject to the regulations of his/her school, a student may elect this option in any course that does not already appear on his/her academic record and in which he/she is otherwise eligible to enroll for credit with letter grade. A student may not elect this option for more than 20 percent of the total credit hours required for graduation.

3. The registrar's class roster will indicate which students have elected this option.

4. A student who is enrolled in a course under this option has the same obligations as those who are enrolled in the course for credit with letter grade. When the instructor reports final grades in the course, he/she will report that any such student who would have earned a grade of A+, A, A-, B+, B, B-, C+, C, or C- has passed the course, and that any other such student has not passed. The registrar will make an appropriate notation on the student's academic record in place of a letter grade, but will not use the course in computing GPA.

College of Science P/NP Option Policy ( CoS Policy Link )

• Only free electives and courses at the 50000-level general education requirement may be taken under the pass/not-pass option. 
• The pass/not-pass grade mode may be entered for courses which are not required by a student’s major(s), minor(s) or science core curriculum.
• Grade mode Passing is equivalent to at a minimum grade of C- had a letter grade been awarded.
• Students may elect to use the pass/not-pass option for no more than 20% of the 124/120 credit requirement for graduation and for no more than two courses per academic year (Fall-Summer).
• The pass/not-pass option cannot be elected for a course that has already been completed with a letter grade. University Regulation.
• Students may take elective credit while abroad using the P/NP mode.  In the case of universities which only post P/NP, the University will apply a calculation process to determine a letter grade.
• Department of Languages and Cultures P/NP policy and Language Placement results. Students must take advanced coursework for a letter grade to receive credit for lower-level language courses.