Everyone has a certain amount of tools to do an implementation. While it is true that the firm will bring some experienced resources to your company, in general, the majority of people working on your system may likely have little to no experience in actually implementing it. First, there is a severe shortage of SAP knowledge. SAP does not have turnover in its consulting force. Since you really cannot get implementation experience until you actually do an implementation, the majority of people will learn on your job.
Experience generally comes in the form of one supervisor who directs inexperienced consultants.
Similar training methods exist in areas such as auditing and financial services at these companies. Second, consulting firms traditionally have very rapid turnover. Thus, at any given moment, your consulting team could rapidly change leading to significant impacts on the efficiency of your job. Despite the lucrative nature of these professional firms, consultants are faced with an up or out structure. It also means that a consultant will also be fired if he isn't promoted at any time.