(1) Risk communication should involve the open, two-way exchange of information between professionals, including both policy makers and experts in relevant disciplines, and the public. (2) Risk management goals should be stated clearly, and risk assessments and risk management decisions should be communicated accurately and objectively in a meaningful manner. To maximize public understanding and participation in risk-related decisions, agencies should: (2.a) explain the basis for significant assumptions, data, models, and inferences used or relied upon in the assessment or decision; (2.b) describe the sources, extent and magnitude of significant uncertainties associated with the assessment or decision; (2.c) make appropriate risk comparisons, taking into account, for example, public attitudes with respect to voluntary versus involuntary risk; and, (2.d) provide timely, public access to relevant supporting documents and a reasonable opportunity for public comment. (OMB and OSTP, Updated Principles for Risk Analysis, September 9, 2007, pp. 10-13