The hourly model is the most popular among clients. The advantage of this model is that you can buy pre-paid blocks of hours (as per your requirements), and as the hours are delivered they are deducted from the total number of blocks purchased. This engagement model offers you complete freedom and control over the work you have outsourced. Whether you are new to outsourcing services or experience, this is a no-risk engagement model worth trying. Moreover, accountants and bookkeepers having small to medium volumes of work can definitely go for this model.