Whether to adopt a central value or a range for the value in appraisal.
Whichever approach is adopted (SCC or a MAC), there were different
views on whether day-to-day appraisal is best served by the use of single,
central value or by a range. In theory a range of uncertainty could be used
consistently in different applications. However in practice in several contexts
users are likely to prefer to work with a single value. Several stakeholders
expressed concerns that the use of a range is more open to the risk
that practitioners may tend to emphasise the single value within the range
that better suits them. Therefore, most interviewees recognised that there
was a trade-off between 1) consistency across applications, which would
be achieved through the indication of a single value, and 2) consideration
of uncertainty, which would be achieved through the indication of a range.