At MSJ the cost of breakage was about 10% cost of the program.  Which meant that more than 10% of the computers broke, but the cost to fix those came to be about 10%.   Broken screens were the largest culprit.   Out of 3 years I only had 2 that needed complete replacement due to mis-use, nothing stolen.

I did learn a few things.
1. Don't expect a sub-$300 device to last 4 years.   At FHU we are going 1:1 next year and I plan to do a 2 year fair market value lease.  This allows us to replace the devices every 2 years, and not have to pay the full cost of the device.   
3. Loose hinges will destroy a device!!!!!!  This started on Year 2, but the hinges started loosing.   If the plastic mount breaks because the screws were loose the device is instantly turned into a parts machine.  

Bjorn Behrendt M.Ed ~ Never Stop Learning
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On Mon, Dec 16, 2013 at 10:53 AM, Bob Wickberg <[log in to unmask]> wrote:
We're getting fairly serious about starting a 1:1 program next year with
Chromebooks.  We'd like to know what experience schools have with the
following, to at the very least tell us how many spares we should have on

What percentage of the devices fail in the course of a year?  How many of
those are failures a normal warrantee would cover, and how many are due to

What percentage of students lose them?  have them stolen?  fail to return
them at year end?

in addition to the cost of the device itself, how much are you budgetting
to procure them, and what are you spending that additional money on?
extended warrantees and/or insurance, cases, apps, what else?

Are you charging the parents anything for insurance? or is the school
carrying any, or are you assuming the risk yourself?

Some of these questions are most pertinent to other schools doing
Chromebooks, but I'd be interested in the answers especially on the loss,
theft, breakage questions for other devices, too.

Bob Wickberg
Technology Coordinator
Brattleboro Union High School District # 6