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| Written by | Margaret Snyder |
| Illustrator | Matthew Stoddart |
| Published | 1997 |
| Publisher | Golden Press |
| ISBN | 0307102068 |
What's the Big Idea? is a Big Bag book starring Chelli and Bag.
See also[]
- "What's the Big Idea" was also used as an announced in-development name for Sid the Science Kid.