Update Planning-roadmaps.md

Planning-roadmaps.md

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 - [On Drafting an Engineering Strategy](https://www.paperplanes.de/2020/1/31/on-drafting-an-engineering-strategy.html) - by Mathias Meyer. Takeaway: How to develop an engineering strategy, even when there is no defined business strategy. Covers prerequisites, drafting objectives, and other key aspects of the process.
 
+- [Prioritization Shouldn't Be Hard](https://melissaperri.com/blog/2019/10/31/prioritization) - by Melissa Perri. Takeaway: "In the absence of a product strategy, the most critical job function of a Product Leader is to set one. If you want your teams to prioritize, you need to provide the framework. And not just some arbitrary framework ...Your people need a real strategy, based on data, and aligned to a company’s goals."
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 ### Roadmaps
 - [Copy of Living Carbon Roadmap](https://docs.google.com/spreadsheets/d/1wq5mRptgiixUawLtS4ley66NZxUS6VKRg2FoJeCPQzM/edit#gid=0) - by Living Carbon. Takeaway: a sample roadmap spreadsheet you can copy and adapt.
 
+- [Effective Product Roadmaps](https://melissaperri.com/blog/2017/02/15/product-roadmaps) - by Melissa Perri. Takeaway: pivots away from Gantt charts and toward "a model that helps us take into account uncertainty and allows us the flexibility for both discovery and delivery. To do this, we focus on Product Roadmaps that are made up of outcomes, a theme, and hypotheses, and we leave out any unvalidated solutions or features."
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 - [How to Build a Product Roadmap Everyone Understands](https://www.prodpad.com/blog/how-to-build-a-product-roadmap-everyone-understands/) - by Andrea Saez. Takeaway: "The litmus test for a good product roadmap is that it’s visual, accessible and clear enough for anyone to scan for answers to the following questions: What are we doing? Why are we doing it? How does this tie back to our OKRs? This is the fundamental idea behind a theme-based product roadmap – and its benefits are enormous and immediate."
 
 - [On Writing Product Roadmaps](https://goberoi.com/on-writing-product-roadmaps-a4d72f96326c) - by Gaurav Oberoi. Takeaway: "Roadmaps are a tool to think about your product beyond the next couple of sprints. They force you to plan, communicate, and get buy in. The win is that your team is aligned, can focus on execution, and reliably achieve long term goals." Includes some useful examples of roadmap docs, and proposed schedules for planning and creating your roadmaps.