Considerations of uncertainty strengthen the scientific validity of a risk assessment. These include considerations of its source and nature, and focuses on uncertainties that can have a significant impact on the conclusions of the risk assessment.

If the level of uncertainty changes during the risk assessment process (e.g. by provision of new information), an iteration of parts or the entire risk assessment process may be needed. It is important to note that while scientific uncertainty is considered during the risk assessment process and the results of uncertainty considerations may be reported; ultimately it is the responsibility of the decision-makers to decide how to use the information in conjunction with the principals of the precautionary approach when making a decision on an LMO.

Example – Scientific uncertainty

“There is no internationally agreed definition of ‘scientific uncertainty’, nor are there internationally agreed general rules or guidelines to determine its occurrence. Those matters are thus dealt with – sometimes differently – in each international instrument incorporating precautionary measures.”

Source: IUCN (2003).