ABSTRACT
Risk.assessment.provides.the.scientific.and.other.evidence.required.to.support.risk. management.decision.making.under.conditions.of.uncertainty..It.is.often.divided.into. two.broad. types:.qualitative.and.quantitative..Qualitative.risk.assessment. is.distinguished.primarily.by.its.lack.of.reliance.on.numerical.expressions.of.risk..That.means. that.qualitative.risk.assessment.depends.on.risk.descriptions,.narratives,.and.relative. values.often.obtained.by.ranking.or.separating.risks.into.descriptive.categories.like. high,.medium,.low,.and.no.risk..When.the.relative.values.are.numeric.but.nominal.or. ordinal.in.character,.such.as.when.index.numbers.are.used,.the.risk.estimate.is.said.to. be.semiquantitative,.but.they.remain.more.qualitative.than.quantitative.in.character.. Quantitative.risk.assessment.relies.on.numerical.expressions.of.risk. The.qualitative.risk.assessment.process.is.identical.to.that.used.for.quantitative.risk.
