Definition(s):
Scale refers to “Ordered set of values, continuous or discrete, or a set of categories to which the attribute is mapped.” (ISO/IEC 25040-1:2011)
“EXAMPLE Types of scales are: a nominal scale which corresponds to a set of categories; an ordinal scale which corresponds to an ordered set of scale points; an interval scale which corresponds to an ordered scale with equidistant scale points; and a ratio scale which not only has equidistant scale point but also possesses an absolute zero. Measures using nominal or ordinal scales produce qualitative data, and measures using interval and ratio scales produce quantitative data“. (ISO/IEC 25040-1:2011).