Same evidence, one read
Most organizations have plenty of data, and each person refers to the part closest to their own role. That makes sense, and nobody is doing anything wrong.
It also means each person's data backs their own story about the problem, which is why the data people have had all along rarely disrupts those stories.
So everyone reads the same synthesis before we meet: your numbers, and the interviews, focus groups and survey that speak to what your existing data can't, with the patterns, connections and implications named.
One shared synthesis cuts through the separate stories.