an obscure term meaning to establish the boundaries of an analysis, evoking the image of rolling out a map on a large surface and then fixing its corners in place, demarcating the area within which deeper work is to take place; this narrowing or limiting of potential scope is helpful to avoid boiling the ocean, as in “Before we start the country deep dives we should talk to the executive team to pin the edges”; see also timebox, which refers to a similar concept focused on duration rather than quantity of work performed