Robert’s 2020 research project involved a survey of NIMEs called Towards a Universal Dimension Space for DMIs: Quantitative Analysis of Trends.
From the abstract of his paper:
In this paper we synthesise previous research on evaluating digital musical instruments (DMIs) to develop a “universal dimension space” for analysing DMIs. We apply this to build an analysis of instruments published in the 2019, 2017, and 2015 NIME proceedings. This dataset allows us to make preliminary quantitative observations of trends in the NIME space, to identify short-comings in current evaluations, and to identify potential DMIs that have not yet been developed. We aim to use this dimension space and dataset to aid future discussion, analysis, and exploration of the NIME field.