Table 12. Perceived contributions of IPC research.

Categories	Studies
Features inspection	McCall & Kölling, 2019; Azcona, Hsiao & Smeaton, 2018; Pereira et al., 2020; Chaweewan et al., 2018; Omer, Farooq & Abid, 2020; Ninrutsirikun et al., 2020; Premchaiswadi, Porouhan & Premchaiswadi, 2018; Turner, Pérez-Quiñones & Edwards, 2018; Ahadi, Hellas & Lister, 2017; Ahmad et al., 2017; al-Rifaie, Yee-King & d’Inverno, 2017; Carter, Hundhausen & Adesope, 2017; Castro-Wunsch, Ahadi & Petersen, 2017; Chung & Hsiao, 2020; Funabiki, Ishihara & Kao, 2016; Watson, Li & Godwin, 2014; Ahadi et al., 2015; Ashenafi, Riccardi & Ronchetti, 2015; Carter, Hundhausen & Adesope, 2015
Approach examination	Liao et al., 2019; King, 2018; Lagus et al., 2018; Lin et al., 2018; Santana, Figueredo & Bittencourt, 2018; Effenberger, Pelánek & Čechák, 2020; Echeverría et al., 2017; España-Boquera et al., 2017; Iqbal Malik & Coldwell-Neilson, 2017; Seeling & Eickholt, 2017; Malliarakis, Satratzemi & Xinogalos, 2016; Seeling, 2016; Hilton & Rague, 2015; Janke, Brune & Wagner, 2015; Rubio et al., 2014; Rosiene & Rosiene, 2015; Scott et al., 2015; Wood & Keen, 2015; Doshi, Christian & Trivedi, 2014; Edwards, Tilden & Allevato, 2014
Intricacies identification	Yeomans, Zschaler & Coate, 2019; Albluwi, 2018; Gomes & Correia, 2018; Delev & Gjorgjevikj, 2017; Dorodchi, Dehbozorgi & Frevert, 2017; Berges et al., 2016; Simkins & Decker, 2016; Allinjawi, Al-Nuaim & Krause, 2014
Group classification	Ullah et al., 2019; Esteero et al., 2018; Wainer & Xavier, 2018; Estey, Keuning & Coady, 2017; Kumar, 2017; Gomes, Correia & Abreu, 2016; Zur & Vilner, 2014; Xinogalos, 2015
Aspects automation	Ureel & Wallace, 2019; Bhatia, Kohli & Singh, 2018; Koong et al., 2018; Fu et al., 2017; Hsiao, Huang & Murphy, 2017; Seanosky et al., 2017; Su et al., 2015; Ureel & Wallace, 2015; Edwards, Shams & Estep, 2014; Heinonen et al., 2014; Hijon-Neira et al., 2014