Our society increasingly faces challenges when we look at the drastic climate change causing floods, migrant flows and displacements; massive fires; geopolitical struggles and wars; and our need for transiting to a net-zero economy to remain sustainable. Those grand challenges call for urgent transitions in our socio-technical regimes for energy, mobility and shelter (Geels, 2010). Indeed, the central spine of one framework for addressing global challenges (George et al., 2016, figure 2) can be read as mapping onto the project life-cycle through 'articulating and participating in grand challenges' (project shaping), 'multilevel actions' (project delivery) and 'impacts and outcomes' (benefits realization). On one estimate, achieving net zero alone will entail a 60 per cent increase in capital investment in the short and medium terms above our existing rate of capital investment, mainly in complex projects (McKinsey, 2022), but we face enormous challenges in delivering on these investments aimed at transitioning to zero carbon. For example, the Muskrat Falls megaproject in Canada turned from a promising hydroelectric sustainable energy facility into one of the most impressive and notorious megaproject failures (LeBlanc, 2020). Although project organizing is highly relevant for delivering the solutions (Kaufmann & Danner-Schröder, 2022) to grand challenges, it still seems overlooked or ignored (Winch, 2022).The assertion that we now live in a volatile, uncertain, complex and ambiguous (VUCA) world is a familiar trope (Bennett & Lemoine, 2014). At the heart of this world, we suggest, is complexity, which has long been investigated within CPO (Geraldi & Söderlund, 2018). Recent research has addressed this theme through various lenses. These include systems engineering to improve project governance and performance (