Do not ask a dealer to "quote a 25-tonne forestry excavator". Specify the complete operational requirement, and you will receive a meaningful commercial quotation.
Use it: When issuing a tender or request for quotation.
A request to "quote a 25-tonne forestry excavator" invites a price for a machine. A specification of the operational requirement invites a proposal for solving your problem — and the two produce very different conversations.
Specifying the requirement also shifts part of the specification risk back to the supplier, who is better placed to carry it. If you name the machine and it underperforms, that is your error. If you name the requirement and the machine they proposed underperforms, the position is different.
The worked example below is deliberately specific. Every line in it changes which machine is appropriate, and a supplier who receives all of them can give a genuinely considered answer.
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Specify
Worked example: eucalyptus plantation clearfell processing.
Interpreting the answers
What a good answer looks like
Ticking a box is not the same as being satisfied with the answer. These are the lines where the response itself tells you something.
What you asked
A good answer
A answer that should worry you
Percentile DBH alongside the average
Both stated, so the supplier can size for the distribution rather than the mean.
Average only, which invites a head specified for stems you rarely cut.
Required production data
StanForD compatibility stated explicitly, with your existing systems named.
Left unstated and discovered to be missing after delivery.
Required support
A specific response commitment — 24-hour breakdown support, named technician location.
"Good support" as an aspiration rather than a requirement.
Maximum mobilisation width
Stated, because it constrains the machine and the permit position.
Omitted, and discovered when the first relocation requires escorts.
Working through it
How to use this checklist
Fill in every line with your own figures before issuing it — blanks invite assumptions
Issue the same specification to every supplier so proposals are comparable
Ask each supplier to state which requirements their proposal does not fully meet
Keep the specification with the contract, so performance can be assessed against what was asked for
Common questions
Frequently asked questions
Won't suppliers resist a detailed specification?
Good ones welcome it. A supplier who understands your application can propose confidently against a clear requirement, and the specification protects them too — it establishes what was asked for, which reduces disputes later. Resistance to specifying the requirement is itself informative about how the relationship will run.
What if I do not know some of the figures?
Get them before issuing the tender. Average and percentile DBH, annual volume, terrain and required operating hours are all measurable, and a specification built on estimates produces proposals built on estimates. If a figure genuinely cannot be established, state that explicitly rather than guessing, so the supplier can price the uncertainty.
Should I name a machine in the tender?
Generally no. Naming a requirement invites a proposal; naming a machine invites a price. If you specify the machine and it underperforms, that is your specification error. If you specify the requirement and the proposed machine underperforms, the position is materially different.
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