Please see http://www.stevens.edu/ssc/tuition_fees_13_14.html for complete information on tuition rates. In 2013-14, the cost per credit will be $1,340 per course.
The cost of the 4-course graduate certificate is therefore $16,080.
Students enrolled in three to four courses in a given semester pay $15,100 per semester (a discounted rate for people taking four courses.) For a full-time student taking four courses per semester, the total cost for the MS degree at the current tuition rates would therefore be $45,300. Additional courses beyond the standard semester load of four courses cost $1,340 per credit.
Part-time and other students taking individual courses - pay $1,340 per credit or $4,020 per 3-credit course.