John Hechinger:

Last fall, high-school senior Duane Wilson started getting Ds on assignments in his Advanced Placement history, psychology and literature classes. Like a smoke detector sensing fire, a school computer sounded an alarm.
The Edline system used by the Montgomery County, Md., Public Schools emailed each poor grade to his mother as soon as teachers logged it in. Coretta Brunton, Duane’s mother, sat her son down for a stern talk. Duane hit the books and began earning Bs. He is headed to Atlanta’s Morehouse College in the fall.
If it hadn’t been for the tracking system, says the 17-year-old, “I might have failed and I wouldn’t be going to college next year.”
Montgomery County has made progress in improving the lagging academic performance of African-American and Hispanic students. See data.
Montgomery spends $47 million a year on technology like Edline. It is at the vanguard of what is known as the “data-driven” movement in U.S. education — an approach that builds on the heavy testing of President George W. Bush’s No Child Left Behind law. Using district-issued Palm Pilots, for instance, teachers can pull up detailed snapshots of each student’s progress on tests and other measures of proficiency.
The high-tech strategy, which uses intensified assessments and the real-time collection of test scores, grades and other data to identify problems and speed up interventions, has just received a huge boost from President Barack Obama and Education Secretary Arne Duncan.

Related notes and links: Wisconsin Knowledge & Concepts (WKCE) Exam, Value Added Assessments, Standards Based Report Cards and Infinite Campus.
Tools such as Edline, if used pervasively, can be very powerful. They can also save a great deal of time and money.