As a company, your employees will benefit from learning and knowing how they work best, in the most suitable environment. With this in mind, they can also look at how others work, and who would work well with their defined team role.
Plus, this theory can bring about a sense of belonging, as everyone recognises what they bring to the table and how the company values them equally, because of the strengths they play to and the weaknesses they work on.
Belbin's nine team roles contribute massively to the development of a department, by allowing for individual and team growth in equal measure. The model does this by allowing members to work in synergy based on their differences, and make the most of their similarities to generate the best possible results.