Based on the fact that MOST organizations have limited data in one way or another, all approaches to category management work aren't the same. Therefore, not all category management can be created equal (makes sense, right?). A great way to think about this is through a tiered approach.
Different Retailers, different Manufacturers, and different categories may appear in different parts of the continuum based on a combination of these requirements. The outputs from being in a Tier 1 environment due to limited data will be fact-based and strategic, but not to the same level of sophistication as companies who have access to a full suite of data.
In net, you CAN do category management on limited data (most likely in Tier 1, based on the above continuum). It's a matter of understanding your limitations based on the data gaps that you have (we talk about this in the next chapter of this e-book), and establishing realistic expectations for the outputs associated with a more basic approach.