How do teachers work in collectives on OER?

My paper is a literature review, including:
? What kinds of resources/OER do mathematics/science teachers use (what is available, what do they use- “landscape”)
? How do they use these resources/OER in their daily practice (lesson preparation; instruction; assessment)?
? How do teachers work in collectives on OER?
? How can we help teachers to design/redesign their resources/OER in/for their teaching?