(Updated at 9:55 a.m.) Arlington Public Schools plans to give a new Macbook Air to every 9th grader in Wakefield, Washington-Lee and Yorktown high schools this school year.

The school system negotiated a deal with Apple that allowed it to purchase the laptops with a portion of the existing $1.2 million APS budget for annual high school computer purchases, Assistant Superintendent for Information Services Raj Adusumilli told ARLnow.com today. Adusumilli declined to reveal the exact cost, citing confidential negotiations.

The plan may come as a bit of a surprise — while APS has had a standing strategic goal of providing one computing device for every student by 2017, earlier this year the School Board shot down Superintendent Patrick Murphy’s proposed $200,000 in supplemental funding for iPads and Google Chromebooks for 2nd and 6th graders. With less than a week to go before the first day of school, APS has still not publicly touted the laptop purchase. The school system answered questions about it in response to inquiries by ARLnow.com, which was sent a non-public document by an anonymous parent.

Adusumilli said the Macbook purchase wasn’t finalized until early July. The devices will be rolled out to students in phases, as a pilot program, at the discretion of teachers and principals.

“It’s going to be done in phases, so it’s not like on the first week of school all the students will get it,” said Adusumilli. “The devices are going to be handed out to teachers first, who will be trained to use the devices in instruction. That’s happening in the first week of school. Devices started getting sent to teachers yesterday.”

For now, only the three Arlington high schools are getting the computers; APS is still working on a plan for laptops at the H-B Woodlawn Secondary Program.

Currently, APS has shared computers in classrooms, with a 1.6:1 student-to-computer ratio throughout the district, according to Adusumilli. APS has been upgrading its network and WiFi capabilities in recent years in anticipation of moving toward a 1:1 ratio, he said.

Instead of computers being shared and remaining in classrooms, each student will have his or her own “personalized” Macbook. Initially the computers will remain at school (in lockers, when students are not in class), but eventually APS plans to allow students to take their laptops home.

“Down the line, if [parents and students] feel comfortable, and the instructors allow it, it can be done eventually,” said Adusumilli. “The most effective way of the personalized device instruction is if the device is with the kid 24/7, but we know this won’t happen overnight.”

Adusumilli said APS will be closely watching the pilot program to help guide future personalized computer deployments. He said experience with other trial programs has led APS to believe full laptops are appropriate for high school students, while tablet computers like iPads are more effective learning tools for elementary and middle school students.

Earlier this summer, APS vehemently denied a rumored tablet purchase for 9th graders. Some parents have reported that their 2nd and 6th graders have been assigned iPads this year. Asked about tablet purchases for lower grade levels, Adusumilli was vague in his response.

“We are preparing for the transition from shared devices to personalized devices at all levels,” he wrote via email. “As part of this preparation each school is conducting a pilot to learn about the instructional benefits provided by personalization. The devices for all the pilots have been purchased. The purchases were made using existing computer replacement funds.”

One parent who learned about the laptop plan contacted ARLnow.com this week and questioned why APS hasn’t told the community at large about the pilot program.

“Through all of this, nothing on any APS channels, including the ‘welcome to school’ info packets for my 9th grader,” the parent said, without giving his or her name. “Why the cloak and dagger communications of what is actually exciting news?”