* Formative: This is the correct spelling, meaning "serving to form, shape, or develop something." It is often used to describe experiences or influences that have a significant impact on someone's development or character.
* Formative assessment: This is a type of educational assessment that is used to monitor student learning and identify areas where students need more support. Formative assessments are typically informal and low-stakes, and they are designed to provide feedback to students and teachers about progress.
It's important to note that "formative" is a more common word than "formative assessment," so it's likely that the word you're looking for is formative.
Please provide more context if you can so I can assist you further.