Imagine a grazing strategy that aims to improve rangeland productivity and wildlife populations by incentivizing planned grazing with access to markets. An assumption in the results chain is that if livestock managers follow grazing plans, they will receive better market access. A search of the literature shows no studies of whether grazing compliance in similar programs leads to improved market access, so the team quickly conducts some key informant interviews with livestock managers in an existing, similar program. Some managers report receiving better market access after implementing grazing plans, and some report not receiving better access. You have evidence for this link — multiple people have observed whether or not the assumption is true. But, the evidence is weak because some supports the assumption while some refutes it.