Enclosed here from CIC an answer to the question what is non routine application. Seems first part for PR application but second part for citizenship application.
http://www.cic.gc.ca/english/helpcentre/answer.asp?qnum=1169&top=5
What is a non-routine application?
Your application may be considered non-routine if:
You asked to change your personal information (name, sex designation, date of birth);
You missed a test, interview, or hearing;
We asked you to submit extra documents, like fingerprints or residence documents; or
After you attended your interview to verify your identity and the originals of your documents, we asked you to come to another interview or hearing.
For citizenship applications only:
You failed a test;
You did not meet the language requirements during your interview (for citizenship applications only);
See also: How are IRCC processing times calculated?
http://www.cic.gc.ca/english/helpcentre/answer.asp?qnum=1169&top=5
What is a non-routine application?
Your application may be considered non-routine if:
You asked to change your personal information (name, sex designation, date of birth);
You missed a test, interview, or hearing;
We asked you to submit extra documents, like fingerprints or residence documents; or
After you attended your interview to verify your identity and the originals of your documents, we asked you to come to another interview or hearing.
For citizenship applications only:
You failed a test;
You did not meet the language requirements during your interview (for citizenship applications only);
See also: How are IRCC processing times calculated?