It’s not really matter what ERP you are going to manage, as long as you implement it in a right way. Let’s assume you are going to implement a full scope implementation with “Big Bang” approach. In my opinion this is the worst case scenario you may have. BB approach is about having all modules go live at the same point in time. That mean a lot of things can go the wrong way and since timefame is already a constant you have to introduce a lot of effort on tracking all of the issues you can came along. Not just issues but also deliverables has to be made on time. They have to be delivered “First time right”. Breaching the timeframe almost always mean breaching your project budget. It not just a question of cost raising rapidly but also raise question on further availability of participants from business as same as the project partner. It’s getting worst if support partner (post go-live support) is not the same as project implementation partner. In that scenario project partner will already have scheduled another project and wont be able to commit same or all of it’s resources to your project extension.

Being a end user for six/seven digits worth ERP you most probably experienced a lot of pressure coming from complex maintenance of such system. Consultants and developers are not always forthcoming when it came to fulfilling end user needs. In most cases they are right about it, if complexity is not an issue than cost would be for sure. However it does not change the fact that as end user you may easily end up spending a lot of your time on repetitive tasks like executing test scripts, mass update of hundreds of master data, extract of some master data definitions from SAP into local excel file which are not available in existing reports. It’s a very time consuming but it can be automated. And it can be done by yourself!