Why did you use brand names, instead of the brand logos, in the BrandIndex survey?
We tested the difference between using brand names and logos in a mixed-sector list. We found in most cases, it made no significant difference whether we asked using the name or the logo. Where it did make a difference, that difference was removed when we had a clear sector context for the brand name. We therefore decided to use the name rather than the logo, as that would enable us to track over a long time-period without concern about changing designs.