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I think the rule of thumb is that when there is a chronology, use numbers
but when there are several options for the same thing, use bullets:
1. Access XYZ in one of these ways:
*abc
*dfg
*qrs
2. Click A.
3. In the QRT dialog box, click X.
> Dear Techwrl'ers:
>
> I need your help to settle an argument with a writer in our group (yeah,
> I'm the editor!). The issue is with bullet lists (versus numbers) for
> all procedures in a software user guide.
>