The hierarchical structure for the Research Needed as shown on the species Fact Sheets is provided here.
Assessors are asked to use this Classification Scheme to indicate the research that is needed on the taxon concerned. In suggesting what research is needed, assessors are asked to be realistic and not simply select everything. The selection should be for those research subjects that are most needed to improve the status of the taxon being assessed and that could realistically be achieved within the next five years.
The attached draft working document (Dec 2012) provides a list of the research needs with definitions, examples and guidance notes on using the system.