ABSTRACT
This chapter begins with a discussion of the circumstances in which risks might be tolerable. This can happen either if they are of no concern or if they are outweighed by the benefits. The chapter examines what risks should be compared and sets out some principles for making such comparisons. It also discusses existing risks which are of no concern. Tolerance of risks is assured if those exposed to them are unaware of their existence. On the other hand, recognition that risks exist, but failure to appreciate their true characteristics, may be a major cause of intolerance. 'True' acceptance of risk involves balancing risks and benefits of activities against each other. The chapter describes the development of a technical basis for risk evaluation is only a part of a process for society to make decisions on tolerability of major hazard risks.
