Order Backlog and Book-to-Bill
Definition
In order-driven sectors — defence, aerospace, plant engineering — quarterly revenue says little about the future, because it only reflects work that was sold some time ago. The order backlog is the forward-looking measure.
How to read book-to-bill
If a company reports €120 million in new orders against €100 million in revenue, the book-to-bill ratio is 1.2 — it is winning more business than it is delivering, so the backlog is growing. A sustained reading below 1 means the buffer is shrinking, even if revenue looks stable.
Framework agreements are not the same as firm orders
A framework agreement sets out terms and a ceiling value, but does not commit the customer to actually placing any orders. Only a specific call-off under the agreement translates into revenue. Press releases tend to quote the full headline value of the framework — the amount actually contracted can be a fraction of that.
How long will it take to deliver?
A backlog stretching over ten years means predictable but slowly flowing revenues. For near-term earnings, what matters is what proportion will be recognised in the next twelve months — many companies break this out separately.
Common mistakes
- Treating the stated value of a framework agreement as guaranteed revenue.
- Assessing an order backlog without considering how long it will take to work through.
- Reading too much into a single quarter's book-to-bill figure — order intake can be highly uneven from one period to the next.
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