Risk ranking & multi criteria analysis

17 important questions on Risk ranking & multi criteria analysis

What are goals of risk ranking methods?

  1. Transparent approach
  2. Utilizes available data
  3. Less demanding than RA (risk assignment )
  4. Assists sampling and monitoring strategies

What are 6 methods for estimation/ranking risks?

  1. Comparative risk assessment
  2. Risk ratio, risk score
  3. Risk matrix
  4. The burden of disease( QALY/Daly), cost of illness (CoI), willingness to Pay (WTP)
  5. Multi-criteria (decision) analyses (MCDA)
  6. Expert judgement

What do you about expert judgement?

  • Most used method
  • Humans are able to combine various sources of knowledge
  • But.......
    • Biases
    • Tunnel vision
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What is comparative risk assessment(1) ?

  • Guidelines are available
  • Applied to one hazard, when compared: ranking is possible, but not easy.
  • Comparative RA evaluates mostly mortality.

What Risk ratio / risk score?

  • Risk ratio: exposure / severity
  • Risk score: exposure * severity

What is definition of a risk?

Hazard occurrence times consequence of the hazard ( effect) on human health

What is matrix for food risk ranking ?

A bit comparable to risk scoring, but exposure and effect endpoints are not aggregated.
  • Come visible

Why is food safety policy-making complex?

  • Many stakeholders
  • Multiple and conflicting objectives

What is the aim of Multi Criteria Analysis (MCA) ?

  • Facilitate the comprehension of similarities and differences among the objectives of different stakeholders
  • Impose more structure to the decision making problem

What is Multi criteria Decision analysis doing?

Establishes the preferences between alternatives for a set of objectives and criteria to asses the extent to which the objectives have been achieved.

What are the 8 steps of Multi Criteria analysis?

  1. Establish the decision context
  2. Identify objectives and criteria
  3. identify the alternatives to be appraised
  4. 'scoring'
  5. 'Weighing
  6. Calculate overall value 
  7. Examine the results
  8. Sensitivity analysis

What do in step 1 Establish the decision context?

  • Problem definition
  • Identify stakeholders

What do when 'scoring' alternatives?

  • Scoring: quantitative or qualitative scales
  • Standardization into 1 common measurement unit

What do you do when 'weighting'?

  • How much do stakeholder care
  • Weighing these preferences
  • Sum over the criteria, per alternative

What does a sensitivity analysis ?

Provides a means to examine the extent to which the relative importance weights of each indicator make any difference in the final results

MCA technique is class was simple, because?

  • 'scoring' is disputable: there are several methods
  • 'Weighing is disputable: subjective
  • Do all stakeholder need to have equal influence?

When is MCA is useful for structuring discussions?

  • Inclined to focus on the differences
  • MCA focus on similarities
  • So ranking of the alternatives might not be that different
  • MCA creates trust among the different stakeholder

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