An OKR without a roadmap is a wish. A roadmap without an OKR is a list of features with no reason to exist. Most teams write one of the two well and treat the other as an afterthought — usually because they were taught to think of them as competing formats instead of two layers of the same plan.
OKRs answer "why," roadmaps answer "how"
An Objective and its Key Results describe the outcome you're aiming for and how you'll know you got there — "reduce onboarding drop-off by 20%" is a Key Result, not a task. It says nothing about what gets built. A roadmap is the sequence of work that's supposed to move that number. When teams skip straight to the roadmap, they end up debating which feature to build next with no shared definition of what "better" even means.
The translation step is where most plans actually break
Going from a Key Result to a roadmap item requires a hypothesis: "we think shipping X will move this number, because Y." Teams that skip writing that hypothesis down end up with roadmaps full of plausible-sounding features that nobody can actually trace back to the goal. Three months later, when priorities get squeezed, those untraceable items are the ones that get cut first — or worse, kept, because nobody remembers they were never connected to anything.
One OKR, multiple roadmap bets — and that's fine
A single Key Result usually justifies more than one roadmap item, and not all of them will work. Treating the roadmap as a portfolio of bets against the OKR, rather than a single committed plan, makes it easier to kill an underperforming initiative without it feeling like abandoning "the plan" — because the plan was the goal, not the specific feature.
Keep the link visible, not just documented once
The connection between an OKR and the roadmap items meant to move it tends to get written once, in a planning doc, and then forgotten the moment work starts. If the roadmap board itself doesn't show which goal each item serves, the team optimizes for shipping the roadmap instead of moving the metric — which is a quiet but common way "successful" quarters still miss the actual target.