Although every agency is different, there are certain universal truths. One of those is around the stages of growth the business passes through and what is needed at each stage.
The Convivio model for agency growth features 5.5 phases. Each is defined very roughly by the number of employees in the business. Roughly is the key word, some agencies accelerate ahead and hit the challenges in each phase at a lower headcount, others take their time and go cautiously and can grow larger before they hit them. So use the size bands as a rough guide.