September, 13 2017 David Steinberg Data for process monitoring now comes from diverse collection and sensor modalities. Often this results in rich data that presents interesting challenges for on-line monitoring. This article, by Grasso et al., looks at image data produced by a machine vision system. The particular focal area for this article is “additive manufacturing” (AM) – the use of 3D printing technology for producing parts. There is growing use of AM to produce