Hoftijzer, J. W. (2008, September). Co-creation: het Nieuwe Doe-Het-Zelf? Product Magazine, 12-14.
Hoftijzer, J. W. (2009a). The collaborative Design Lab: The future designer. Paper presented at the 5th World Mass Customization and Personalization Conference: Mass Matching – Customization, Configuration & Creativity, Helsinki, Finland.
Hoftijzer, J. W. (2009b). DIY and Co-creation: Representatives of a Democratizing Tendency. Design Principles and Practices, an International Journal, 3(6), 69-81.
Hoftijzer, J. W. (2009c). The Implications of Do-It-Yourself. Paper presented at the International Conference on Integration of Design, Engineering and Management for innovation, Porto, Portugal.
Hoftijzer, J. W. (2011a). Design for DIY, Beyond the fixed solution space
Paper presented at the World Conference on Mass Customization, Personalization, and Co-Creation 2011: Bridging Mass Customization & Open Innovation, San Francisco.
Hoftijzer, J. W. (2011b). Doe-Het-Zelf Product Design (keynote). Paper presented at the Design for [Every]one, Kortrijk, Belgium.
Hoftijzer, J. W. (2012a). The Independent designer, the Independent User (keynote). Paper presented at the Operae 2012, autoproduzione a Torino, Torino, Italy.
Hoftijzer, J. W. (2012b). Sustainability by Do-It-Yourself product design
User design opposing mass consumption. Paper presented at the DRS 2012 conference, Chulalongkorn University Bangkok Thailand.
Hoftijzer, J. W. (2015, October 20th-22th, 2015). Implementing ‘Design for Do-it-Yourself’ in design education. Paper presented at the The 8th World Conference on Mass Customization, Personalization, and Co-Creation (MCPC 2015), Montreal.
Hoftijzer, J. W. (2017a). ‘Chiaroscuro’: drawing light and shadow, workshop. Florianopolis: Congresso Ergodesign/ ISUHC / CINAHPA 2017, Universidade Federal de Santa Catarina, Florianopolis, Brazil.
Hoftijzer, J. W. (2017b). If you don’t draw it, you can’t see it. In L. M. Fadel, V. R. Ulbricht, & C. Batista (Eds.), Design para Acessibilidade e Inclusão (pp. 59-73). Sao Paulo, Brazil: Blucher.
Hoftijzer, J. W. (2017c). Pastel as a Swift Sketch Tool for Design Education and Practice: a Qualitative Review Paper presented at the E&PDE, Oslo.
Martin, D., & Hoftijzer, J. W. (2017). Implementing a ‘DIY’ product design methodology in fashion design Fashion Design for DIY. Montreal, Canada: World Design Summit.