Each implementation of Microsoft Dynamics NAV is completely different from the others. The reason is because each company, no matter how similar the industry, is run differently. The company that is going to use the ERP software (usually called the customer) is different, the requirements are different, the scope is different, and even the team implementing it might be different. This brings a lot of uncertainty to the process and is the main reason why methodology has to be used.
Implementing Microsoft Dynamics NAV is considered as working in a project environment. By definition, a project is a temporary endeavor undertaken to meet unique goals. The company implementing Microsoft Dynamics NAV (usually called the consultant) is probably used to this kind of environment. On the other hand, the customer is probably used to working in an operational environment, where the same processes are repeated over and over. For the customer, implementing a new ERP system is like running in...