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Low-dimensional spatial representations of political preferences are a wide-spread feature of voting advice applications (VAAs). Currently, VAA spatial maps tend to be defined on the basis of a priori reasoning. This article argues that VAA spatial maps should be empirically validated to safeguard fundamental psychometric properties – in particular, unidimensionality and reliability. We suggest dynamic scale validation as a pragmatic method for improving measurement quality in VAA spatial maps. The basic logic of dynamic scale validation is to exploit early user data as a benchmark against which ex-ante defined maps can be evaluated. We draw on data from one of the most institutio-nalised VAA settings, Switzerland, to illustrate this dynamic approach to scale validation. Acta Politica advance online publication, 28 February 2014; doi:10.1057/ap.2014.

Spatial maps in voting advice applications: The case for dynamic scale validation