Assertion: purpose's week | /r/HasProperty | or three times
Facets:
Source sentences:
text: -- at the point a piece of work is ready to be turned in (or once the work has been returned by the teacher) the student or teacher identifies that work for inclusion in the portfolio; at periodic intervals -- instead of selecting samples when they are completed, the samples can be stored so that selection might occur every two (three, six or nine) weeks or once (twice or three times) every quarter (trimester or semester);
text: -- instead of selecting samples when they are completed, the samples can be stored so that selection might occur every two (three, six or nine) weeks or once (twice or three times) every quarter (trimester or semester); at the end of the ... unit, quarter, semester, year, etc.