Literacy Bug has a great website, and explains the language experience approach here:
https://www.theliteracybug.com/using-the-language-experience-approach
“In the traditional Language Experience Approach (LEA) teachers use a shared experience – often involving photographs/images of that experience – as a prompt to collectively write a text with the learners. This text – often a series of photographs/images with captions – becomes a text that the group reads, re-reads, revises and extends. In the process, the teacher can draw learners’ attention to phonetic and semantic patterns in the co-constructed text.”