Author's accepted version (postprint).This is an Accepted Manuscript of an article published by Emerald in International Journal of Managing Projects in Business on 19/06/2019.Available online: https://www.emerald.com/insight/content/doi/10.1108/IJMPB-08-2018-0145/full/pdf?title=exploring-scenario-development-a-case-study-of-two-collaborative-research-projects