- Page 1, line 30 "this sections" -> "these sections"

- Page 1, line 31: "The core concept of the MPIT interface is a set of variables that each expose a particular property, setting, or performance measurement from within the MPI library." =>
	The purpose of the MPIT interface is to provide a mechanism for the MPI library to expose a set of variables that represent a particular property, setting, or performance measurement from within the MPI library.

- Page 2, line 17 and 18: C-binding => C binding

- Page 3, line 10: one sided => one-sided

- Page 5: "zero character" => "null character"

- Page 7: I think we need a brief example of what an enumeration variable is, suggest to add to line 10: , e.g. the state of a resource. 

- Page 11 line 22-23: it is not a guarantee that can be changed at any time => add "it" between "that" and "can"

- Page 12 line 21 and 34: extra space

- Page 13 lines  25, 33, 41 and page 14 lines 3, 13, 33: "value of a variables" -> "value of variables" or "value of a variable"

- Page 14 line 5: get_um => get_num

- Page 18 line 6: controlvar -> perfvar

- Page 22 line 12 and line 32: get_vars should be get_contents