When working on vision with stakeholders, I like the Cover Story exercise, which I outlined last week. A great exercise to follow is is the Back-Plan.
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It starts with the end result of the cover story (i.e., the future that will result from the roadmap) and then works gradually backward to the present. Each step backward must be something that delivers value on its own, so momentum builds over time.
Try this with your organization. You can see other stakeholder tips in Chapter 8 of my book, Product Roadmaps Relaunched. Like? Hate? Tell me a story.