A struggling Denver, Colo.-area school district will no longer divide students by grade level beginning next year, but rather by what they know -- a change officials hope will boost test scores and graduation rates. "In a
standards-based system, time becomes the variable and learning is the constant," said Roberta Selleck, superintendent of the Adams 50 school district. "When a kid can demonstrate proficiency of a standard, they move on. There is nothing magical about a quarter, semester or the end of school. That becomes blurred. Learning becomes much more 24/7."