For example the input is (a,b),there are at least 5 equivalence classes: the numbers less than a; 国 a, the numbers between a and b; e b; the numbers greater than b; functional testing,the tester identifies each item of functionality or each function implemented in the module and uses data to test each function. >校长办公室 >Office of the President¾校长办公室 ¾Office of the President For example the input is (a,b), there are at least 5 equivalence classes: the numbers less than a; a; the numbers between a and b; b; the numbers greater than b; functional testing, the tester identifies each item of functionality or each function implemented in the module and uses data to test each function