Demand themes are built from the attributes already sitting on the products, and every attribute is joined to sales. So a theme can be sized in dollars, and the share of it you hold measured against the whole category.
A sizing is only as good as the definition underneath it. Themes are defined once and applied the same way everywhere, which is what makes one category comparable to the next and your portfolio comparable to anyone else's.
A theme is a rule over attributes that already sit on every UPC. Nothing is asked of a panel and nothing is projected from a sample, so the theme applies to every product in the category at once rather than to the ones someone had time to code.
Themes are standardised across the business, so a theme means the same thing in snacks as it does in beverages. Teams stop regrouping products by hand for every deck, and two analyses stop disagreeing because they cut the set differently.
A theme is a claim until it carries a number. Every attribute is joined to sales dollars, so the size of a theme and the share of it you hold come back as money rather than as an index or a direction.
The worked example above is one category. Here are three more, each sized from attributes the products already carry.
A sized theme is only useful if someone acts on it. The gap tells you what to expand, what to delist and where to put the next launch.
Decide what to expand, delist or localize from the demand themes actually driving the category.
Thirty minutes on your categories. How the record gets built, what it holds, and the questions your team could put to it.