While the introduction of artificial intelligence (AI) solutions has large potential to improveorganizational decision-making, it requires a further understanding of how humans and AI can collaborate. Through the lens of situatedness, this paper attempts to provide insight into the wider nature ofhuman-AI collaborative decision-making. Based on a case study on AI-assisted breast cancer screening, two important findings can be highlighted. First, decomposition and decoupling through temporaldivision of action with either humans or AI dominating enable an advanced human-AI decision processto be decoupled while enabled by a foundation of shared situatedness. Second, decision-makingemerges as a dynamic sensemaking process with each additional human-AI interaction evolving thedecision-making process until a final decision outcome is reached.