Preparing a multi-model inquiry without confusion

A multi-model enquiry written as prose almost always loses something. You write four paragraphs about six models, the supplier answers the three they understood, and the reply comes back as prose too. Two rounds later nobody can say with confidence which answer belonged to which model.

The fix is structural, not a matter of writing more carefully. Give every model its own row, and give every row the same columns.

The seven columns

Use these six columns, in this order. They are the ones a supplier needs in order to reply per line rather than per email:

Line number. Exact model designation. Quantity. Gas or service. Cylinder thread. Outlet designation.

Then add a seventh column headed Notes, and use it only for what is specific to that line. Anything true of the whole enquiry - delivery address, timing, your reference number - goes above the table, not in it.

Five rules that keep it answerable

One row per model, always - Even when two lines differ only in quantity. Merged rows are the thing that gets answered as one line.

Number the lines and keep the numbers - Ask the supplier to reply against your line numbers. It makes the second round readable and it makes a purchase order easy to build.

Do not sort the table between rounds - Re-sorting breaks every reference anyone has made to it. If you must reorder, keep the original line numbers attached.

Put unknowns in the cell, not in a footnote - An empty cell reads as "no requirement". The word UNKNOWN in the cell reads as a question.

Send it as text in the email as well as an attachment - Attachments get separated from threads. A table that is also in the body survives being forwarded.

When the list gets long

If your enquiry runs past about fifteen lines, split it by gas rather than by quantity or by urgency. Technical replies are assembled per medium, so a table that is already grouped that way is answered in one pass instead of three.