There are two types of scale in general. One is the global scale (generic) and other is the local scale (Specific). Global scale is a kind of standardized work which can be used across a variety of settings. For instance, SERQUAL is a service quality gap identification measure widely used across banks, institutions, car rentals etc. However, the researchers were quick to understand the limitation of a fully generalized scale, hence a local specific scales started to be developed and used. LIBQUAL is a good example of local scale, to measure quality gap of a specific application or domain. Here this scale is used to exclusively measure library services. This is the local scale, however based on the global scale.
Rotter (1996) developed an internal-external scale that measures the level of internality or externality of a person at a generic level. Further, Levenson (1973) developed a multidimensional locus of control scale classifying three loci of control viz., Oneself, Powerful Others and Chance/Fate. This scale focused more on the external control. Similarly, Wallston, Wallston and Devellis (1978) developed a multidimensional health locus of control (MHLC) scale using Levenson’s three loci of control with outcomes specific to measure health. Wallston, Stein and Smith (1994) took this a step further in specificity and created another scale as “MHLC Form C” which measured the outcome specific health locus of control measure. To conclude, researchers can choose any kind of instrument or scale, but should it be a generic or specific measure, largely depend on constructs to be measured.