Glossary

Plain-language definitions of the terms this bundle uses. It grows as the bundle does.

• Acceptance test: a written description of what a usable result looks like for one type of job, set down before any model is tried, so every result is judged the same way.
• Answer key: a right answer that knowledge can be checked against automatically, such as working code, a system setting, or a database query result. Policies and judgment have none.
• Chargeback: passing the actual cost of AI use to the business unit that incurred it, so the cost comes out of that unit's budget.
• Cost per accepted result: everything spent to get usable output, including failed attempts and the time people spend checking and fixing, divided by the number of results that passed the acceptance test.
• Criteria: the handful of factors that should actually drive the decision, as opposed to everything you could consider.
• Decision guide: a page that helps you make one recurring, consequential decision: the options, the criteria, the tradeoffs, and when each choice wins.
• FinOps: the practice of managing technology spending, first cloud and now AI, by making costs visible and assigning them to the teams that incur them.
• Knowledge-Centered Success (KCS): a practice from customer support in which the people who use knowledge articles also fix or flag them as they go. It was formerly called Knowledge-Centered Service.
• Last-verified date: the date someone last confirmed that a piece of knowledge is still true. It protects you only if the system acts on it.
• Open-weight model: an AI model whose trained weights are published for anyone to download and run. Its license may still limit how it can be used, so open-weight is not the same as open source.
• Pay-per-use spend: AI charged by the unit of use, usually per token, through APIs, coding agents, and automations. The bill rises and falls with use.
• Reversibility: how cheaply you can undo a choice if it turns out wrong; cheap-to-reverse decisions deserve less deliberation.
• Routing: sending different requests to different AI models. It can mean a person assigning a model to each type of work, software choosing a model for each request, or a backup model taking over when the first is unavailable.
• Seat license: a fixed monthly price per person for an AI tool. The bill stays the same whether the person uses it daily or never.
• Semantic layer: a defined set of business measures, such as revenue or active customers, that an AI can query. It can decline questions outside its definitions.
• Showback: reporting AI costs to the teams that incurred them without charging those teams. A central budget still pays.
• Token: a fragment of a word. AI models read and write in tokens, and pay-per-use pricing counts them.
• Total cost of ownership (TCO): the full lifetime cost of an option, not just the upfront price. It includes maintenance, support, and the cost of your own time.
• Tradeoff: what you give up by choosing one option over another; the guides cite the evidence behind the important ones.
• When each wins: the conditions under which a given option is the better call, written as plain "if your situation is X, lean toward Y."