ABSTRACT
Many Decision Support Systems (DSS) afford customization
of inputs or algorithms before generating recommendations
to a decision maker. This paper describes an experiment in
which users make decisions assisted by recommendations of
a DSS in a fantasy baseball game. This experiment shows
that the act of customizing a DSS can lead to biased decision
making. I show that users who believe they have customized
a DSS’s recommendation algorithm are more likely to follow
the recommendations regardless of their accuracy. I also
show that this customization bias is the result of using a DSS
to seek confirmatory information in a recommendation.