The book-to-bill ratio is calculated by dividing the value of orders
booked over the past three months by the value of sales billed during
the same period from companies in IPC's survey sample.

For the IPC survey, only N. American board fabricators are included (and
yes, I believe they have to be IPC members). IPC does not release the
names of the companies that participate; however, it is my understanding
that more than a few of the largest PWB fabs in N. America do not
participate. Dedicated board distributors/brokers are not allowed to
participate, yet since so many US/Canadian fabs now broker some amount
of boards, IPC asks them to report the percentage that are not built in
N. America.

Some other countries track their national PWB shipments -- Japan does
through the JPCA, and Germany through VDL, for example. There is no
single entity that aggregates all the various national data into a
single monthly figure, however.


Mike Buetow
Circuits Assembly
w/m 617-327-4702

>>> The CIRCUITS ASSEMBLY Directory of EMS Companies  -- 2,000 Listings
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-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of cguitar
Sent: Tuesday, September 28, 2010 7:25 PM
To: [log in to unmask]
Subject: [TN] Book to bill ratio

the ratio is on North American market.

how is the ratio arrived at? only from NA board makers who are members
of IPC?

how about the rest of the world, many of which are not members of IPC?

appreciate some input

tks,
th


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