Many years ago as I started researching and analyzing the differences between major BI vendors, one criterion that I always used was whether these vendors ate their own dog food. In other words, did a vendor executive team use the same solutions for data collection, building metrics and dashboards to run their own companies that they also tried to sell to their clients? Those who did tended to score higher in my evaluations.
The same guiding principle is applicable to Forrester: you have to eat your own dog food in order to convince the clients to buy your products and services. Hence, our methodologies, such as Forrester Waves are completely open and transparent (thank you, Doug Henschen, for recognizing this in your recent blog), and we encourage our clients to challenge us on every point made in our Waves.