Without Surprise.

Vocabulary · Volume 1 and Volume 2

Double bubble

The temporary overlap of old and replacement environments during a transition. It does not require exact doubling of cost. Count useful business outcomes once even when both systems process them.

The definition appears in the Volume 1 glossary and Volume 2 glossary. This page collects where the book uses the term and where the blog takes it up.

Discussed in the book

Chapters where “Double bubble” is discussed at length, ranked by how directly each section treats it.

Blog posts that discuss “Double bubble”.

Ask the book about double bubble