Sustained shared thinking involves talking about something in a way that moves thinking on for the child and the adult.
The conversation between a child and an adult (or children talking together), needs to be two sided as both parties contribute. This can be about a problem or to make something clearer. It can be to extend a story or evaluate ways of doing things. The important thing is that the people involved discover something new from the conversation. This could be many things but for the adult it might be that they discover something new about the child’s thinking.