One of the biggest questions you might face is whether to run your new ERP systems in parallel with your existing one during the transition.
In this article, we’ll break down the pros and cons of running systems in parallel, helping you understand when it makes sense—and when it might not. We’ll also highlight key factors to consider as you plan your ERP implementation.
And if you’re still unsure or want advice tailored to your unique situation, our team is here to help—feel free to reach out and schedule a conversation.
If you enjoy this article and would like to talk to Sabre Limited’s president Rob Jolliffe to chat about these concepts, you can book a one-on-one 30-minute call with him at https://calendly.com/robert-jolliffe/30min
What Does It Mean to Run ERP Systems in Parallel?
When implementing a new ERP system, businesses often face a critical question: should you run your new system in parallel with the old one?
“Parallel adoption,” or running ERP systems in parallel, is a common implementation strategy. It involves operating both your legacy ERP and your new system at the same time for a limited period. This provides a safety net, allowing for real-time comparison and validation of the new system’s performance—without disrupting day-to-day operations.
While this approach can reduce risk and improve confidence in your implementation, it also comes with challenges. Let’s explore the pros, cons, and smarter alternatives.
Why Run ERP Systems in Parallel?
Here are the top reasons companies choose this approach during their ERP transition:
1. It Provides a Safety Net
Implementing a new ERP system is a major change, and even with extensive testing, there’s always some uncertainty. Running both systems in parallel allows your team to fall back on the old system if any unexpected issues arise with the new one.
However, keep in mind: this should be a temporary solution. The goal isn’t to maintain two systems forever, but to ease the transition. Thorough testing before go-live is still essential to avoid prolonged dual operation.
2. It Enables Direct Comparison
Running systems in parallel allows you to compare real-time data and workflows between the old and new systems. This can help:
- Identify gaps or discrepancies
- Validate key reports
- Confirm business processes are functioning correctly
- Highlight improvements in speed or usability
This kind of side-by-side analysis gives your team the confidence to move forward with full adoption.
3. It Offers Psychological Reassurance
Let’s face it—change is hard. For many teams, knowing that the old system is still there provides peace of mind during a potentially stressful transition. It can help users feel more confident, reducing resistance and improving morale.
That said, it’s important not to lean too heavily on this crutch. Trust your implementation team’s expertise—they’ve likely guided many companies through similar transitions.
4. It’s Not the Only Way to Validate the System
A full parallel run may seem like the safest way to test the new system—but it’s not your only option. In fact, a limited parallel run can be just as effective, with fewer complications (more on that shortly).
Pitfalls and Challenges of Running in Parallel
Running ERP systems in parallel can present various challenges and potential pitfalls. It’s crucial to be aware of these factors to make informed decisions and navigate the implementation process effectively. Here are some key considerations:
- Increased complexity and workload: Maintaining two separate systems simultaneously requires additional resources, including hardware, software, and personnel. Synchronizing data and ensuring consistency between the systems can be demanding and may strain your IT team.
- Extended timeframe and cost: Running in parallel over an extended period can be costly, with expenses ranging from software licenses to ongoing support and maintenance. Evaluating the financial implications is essential when considering the benefits and risks.
- Potential confusion and inefficiencies: Having the option to fall back on the old system can lead to user resistance and a lack of commitment to the new system. Clear communication and comprehensive training are crucial to facilitate a seamless transition.
- Unexpected consequences and complexities: A full parallel run may result in unanticipated difficulties, such as running both systems for longer than expected or facing challenges when decommissioning the old system. Planning for contingencies is vital to address any unforeseen issues.
An example worth mentioning is a client who initially opted for a full parallel run but encountered unexpected consequences. They found themselves running both systems for a much longer duration than anticipated, facing increased complexity, and encountering difficulties in fully decommissioning the old system. This experience highlights the importance of carefully considering the potential challenges and planning for contingencies during the implementation process.A Smarter Solution: The Limited Parallel Run
To avoid the downsides of a full parallel run, consider a limited parallel run—a more focused, efficient testing strategy.
What Is a Limited Parallel Run?
Instead of running your entire ERP system in parallel, a limited run tests only select order types or business processes. Think of it as a pilot program that lets you validate key parts of the system before full rollout.
Benefits of a Limited Parallel Run
- Lower complexity: Less duplication of effort and simpler data management
- Reduced costs: Fewer resources required to maintain two systems
- Better user focus: Training and feedback can be directed to specific departments
- Faster implementation: Get to full adoption sooner with fewer delays
How to Do It Right
- Iterate: Tweak the new system based on findings, and scale the rollout gradually.
- Identify core processes: Choose order types or transactions that represent the bulk of your daily operations.
- Create a test plan: Define what success looks like and document what needs to be validated.
- Use real data: Simulate live scenarios to stress-test the system.
- Gather feedback: Encourage users to report issues, confusion, or gaps.
Conclusion
The decision to run your new and old ERP systems in parallel is an important consideration for mid-market ERP systems, particularly in the manufacturing sector. Throughout this article, we have explored the reasons for running in parallel, the pitfalls and challenges associated with it, and a smarter approach known as a limited parallel run.
If you’re considering implementing a new ERP system or have further questions, we invite you to schedule a conversation with our expert team. Our knowledgeable professionals are well-versed in mid-market ERP systems, particularly Manufacturing with Dynamics 365 BC.
If you enjoyed this article and would like to talk to Sabre Limited’s president Rob Jolliffe to chat about Business Central, you can book a one-on-one 30-minute call with him at https://calendly.com/robert-jolliffe/30min
Want to learn more? Contact our experts today.
