For developing software there are many methodologies such as Prince2, Extreme Programming or the Microsoft Solutions Framework.
Most of these methodologies are suitable to be applied to Microsoft Dynamics NAV but they should be used properly. Because of the flexibility of the product it is easy to leave out steps in the process that should be there.
In Microsoft Dynamics NAV it is extremely easy to quickly create and modify business software. This is by far the strongest selling point for the solution but also the biggest pitfall.
When an end user requests a change to the application it is tempting for most experienced developers to go into the application and create it, preferably, in the production database ...