“…Other data collection methods like the interview and the observation were fewer in use. This is no surprise, as the interview technique is not appropriate for conducting quality cost surveys and the observation method Themes Future research suggestions Sectors, sub-sectors and units Examining CoQ in service systems (Dror, 2010), water utility organizations (Banasik and Beruvides, 2012) and public utilities including waste water, storm water and electric utilities (Banasik and Beruvides, 2012); investigating if there is a significant difference between private and publicly owned utilities with regard to CoQ (Banasik and Beruvides, 2012); assessing the cost of Six Sigma quality beyond mass manufacturing (Rodin and Beruvides, 2012); examining quality failure costs in several industry sectors (Liapis et al, 2013); studying CoQ in service organizations (Lari and Asllani, 2013;Ozkan and Karaibrahimoglu, 2013;Chopra and Singh, 2015;Zhang et al, 2015), a specific industry branch (Lari and Asllani, 2013;Kerfai et al, 2016), and in several types of industries (Lari and Asllani, 2013;Grbac et al, 2015;Chatzipetrou and Moschidis, 2017;Farooq et al, 2017;Glogovac and Filipovic, 2018;Moschidis et al, 2018); carrying out CoQ research for complex production lines (Omar and Murgan, 2014) and process configurations (Chopra and Singh, 2015); applying the Activity Based Costing (ABC) method of CoQ in the whole organization and in selected divisions (Zhang et al, 2015); exploring whether there are differences in terms of cost of poor quality in different sectors (Chiarini, 2015); studying the implementation of a quality costing system in a hospital (Uyar and Neyis, 2015); implementing the methodology of "quality cost optimization" in large and complex industries (Chopra and Singh, 2015); evaluating CoQ in retail companies (Chatzipetrou and Moschidis, 2016), departments supporting operations and quality, such as purchasing, engineering, sales and marketing…”