open source is not a standard. Th use (of) bibliometric criteria (metadata): metadata are a different thing from bibliometric: did you mean "bibliographic" ? If yes, maybe just bibliographic metadata is sufficient.

Need to be more explicit about what is meant by open standards here. Don't confuse open standards with open source. Also while metadata is important for resource discovery, *requiring* the creation of metadata can be a barrier to the release of OER. Ideally you want a mix of automatically captured metadata and user generated metadata that can grow dynamically as the resource is used.

Missing two "of" in this sentence.