Over six years after SAP first released SAP S/4HANA, and many SAP customers are still considering their migrations to the ERP solution. Early last year, SAP moved the date when it would end its support of SAP Business Suite 7 (including solutions like  SAP ERP 6.0, SAP CRM 7.0, SAP Supply Chain Management 7.0, SAP Supplier Relationship Management 7.0, and SAP Business Suite powered by SAP HANA) from 2025 to 2027. While this shift certainly gave SAP customers some breathing room, it doesn't mean that the deadline isn't fast approaching. Migrating to SAP S/4HANA is a complex and time-consuming process. 

One of the first things an organization needs to decide during its migration project is which type of implementation path they'll take. There are really three types of SAP S/4HANA implementations strategies: brownfield, greenfield, and hybrid. Deciding on which one depends entirely on your organization, its IT infrastructure, and the goals of your migration to SAP S/4HANA. Here, you'll find a break down which options are available to SAP customers so you can make the best decision for your business. 

What Is a Greenfield Deployment for SAP S/4HANA?

Like wiping a slate clean, a greenfield approach is essentially a reset button. A transition using a greenfield approach is a complete reengineering of a business’ SAP processes and workflows. Additionally, any customization done on SAP ECC 6 is completely wiped away during a greenfield implementation. This certainly has its pros and cons. For a legacy organization that has been using SAP for a long time and has accumulated a lot of complicated workflows and heavily customized code, a greenfield approach might be the fresh start needed to overhaul its use of SAP and reduce complexities. This is what the “back to standard” movement among SAP customers is all about. Greenfield is also perfect for companies new to SAP, if they are moving their data over from a non-SAP system.

It’s worth noting that a greenfield implementation is what SAP recommends when making the jump to SAP S/4HANA. It can be done either on-premise or in the cloud, and allows users to predefine migration objects. From a cost standpoint, greenfield implementations result in lower total-cost-of-ownership (TCO) and time-to-value.

Theoretically, you can have the core elements of SAP S/4HANA up and working in about three months. But, migrating all your data onto a blank system can take some time. This is a significant undertaking and will almost certainly take longer than three months. What’s more, it’s definitely a riskier maneuver than a different implementation strategy. You also need to redevelop any necessary system customizations critical to your business that you were previously running on another version of SAP, which can be another significant time sink.

What Is a Brownfield Deployment for SAP S/4HANA?

Whereas greenfield is a complete overhaul, a brownfield approach is more like an upgrade or renovation of your SAP ERP. You can get SAP S/4HANA up and running, while also migrating your existing SAP workflows and systems over to the newest version of SAP. You also can keep your tried-and-true business processes, along with the customizations you’ve been using to manage your data. Yet, you don’t have to bring everything over. Brownfield lets users reevaluate and edit their existing processes, and port over the ones that are working. On paper, a brownfield approach is both the cheapest and fastest implementation strategy. It’s also a lot less risky than greenfield.

Yet, brownfield isn’t without its downfalls. Since you are essentially porting over everything from your previous SAP operating system, it’s often seen as an innovation block. The success of the implementation lives and dies by how well your current workflows and systems are replicated. This doesn’t give a lot of room for examining how to cut through the complexities and poor workflows of your current process. Because of all the complexities that come with porting over customization and workflows, a brownfield implementation is best done on-premise.

Brownfield is best for customers who are looking to continue using their current solutions and rapidly convert from SAP ECC 6 (or another version of SAP) to SAP S/4HANA.

What Is a Hybrid Deployment on SAP S/4HANA?

The hybrid implementation is probably the most widely used model. At the end of the day, large businesses need to redesign some of their workflows and systems, while also maintaining some critical customizations and solutions. Simply starting over from scratch or transferring your data and workflows over to a new version of SAP is going to cost both time and money. A hybrid approach—which cherry-picks the best parts of greenfield and brownfield implementations—is best for large companies with a lot of data and complex systems. There are a lot of hybrid approaches to choose from that pull different aspects of greenfield and brownfield implementations.

With a hybrid approach, you mitigate a lot of the risks associated with making the jump to SAP S/4HANA. You can selectively redesign certain aspects of your system, while also keeping the ones that work at the same time that you’re cleansing and moving your data into the new system. The only real downside is that a lot of hybrid implementations require a third-party solution or tool to get the job done and distill the aspects of greenfield and brownfield that are part of the migration plan.

Choosing which SAP S/4HANA implementation strategy is right for your company can be a difficult process. A lot hinges on your successful move over to the newest version of SAP. If you decide that a move would benefit your organization, the good news is that there are options for a successful journey to SAP S/4HANA.

Don't forget to register for The State of Enterprise Asset Management for SAP Customers in 2022 on Jan. 26, where we'll be breaking down the trends our research team uncovered in the EAM space.