Before revision:  But research contributions play distinct roles in the unfolding drama of scientific debate, agreement and advance, and institutions may value different kinds of advances . Computational power, access to citation data and an array of modeling techniques have given rise to a widening portfolio of metrics to extract different signals regarding their contribution.
After revision:  But research contributions play distinct roles in the unfolding drama of scientific debate, agreement and advance, which are differentially valued by scientists and their institutions . Computational power, access to citation data and an array of modeling techniques have given rise to a widening portfolio of metrics to extract different signals regarding their contribution.