Thompson says she will ask the school board to hire an outside independent investigator, retired FBI agent John Mulligan, to investigate the matter.
She says she received information alleging grades may have been changed without documentation at some high schools.
Thompson says she has no evidence to support the allegations, but thinks it's important to examine what's going on.
She will make her request to the board Tuesday.
Montgomery Public School Superintendent Barbara Thompson says she is looking into allegations of grade changing.