Estimating Using Inch-Pebbles Wherever Possible
Inch-pebbles (Appendix 2, Glossary of Terms) are the breakdown of each task into very small pieces, no more than two days in duration, generally only one day long (see How to Use Inch-Pebbles When You Think You Can’t [Rot99] and Rapid Development: Taming Wild Software Schedules [McC96]). If you’re familiar with XP, inch-pebbles are user stories. Inch-pebbles are either done or not done; they are not some percentage complete. Collections of inch-pebbles are the multiple-day or multiple-week tasks that teams normally create when they define tasks in a schedule. In reality, inch-pebbles are a way to define tasks that fit into small timeboxes—one or two days in duration.
Every project can use inch-pebbles ...
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