At the start of the process--and most panels would work the same way--the panel or the minister, depending on which jurisdictions we work with, because there are some differences there, will issue environmental impact statement guidelines to the proponent. So the proponent is primarily responsible to provide information requested by the minister to the panel, and that forms the core of the information made available as part of the review. All participants in the review may provide their own analyses as well that will be taken into account, and panels typically have their own discretionary authority to request additional studies if they feel it's important to do so.
On October 27th, 2011. See this statement in context.