6 Ways to Modernize Legacy Systems: Which One Suits You?

Selecting the correct modernization method for your legacy system is essential to achieve a seamless transition while minimizing operational interruptions. There exist six distinct modernization strategies for legacy systems and each comes with specific pros and cons that you should evaluate.

The 6 Strategies

1. Encapsulation
   Encapsulation enables legacy systems to work with modern applications by adding a new interface while preserving their core functions.
   • Pros: The current systems require no extensive modifications while ensuring minimal operational disturbance.
   • Cons: This method provides limited scalability and fails to address existing performance problems.
2. Rehosting
   Rehosting means relocating the legacy system to a new infrastructure platform like the cloud without modifying its existing architecture.
   • Pros: Quick migration, minimal changes to existing system.
   • Cons: The process fails to utilize modern technology capabilities which leads to potential performance limitations.
3. Replatforming
   Replatforming requires architectural changes to adapt the system to modern infrastructure by transitioning a legacy system to new operating systems or databases.
   • Pros: Leverages modern infrastructure, better performance.
   • Cons: Can be time-consuming and costly.
4. Rewriting
   Rewriting requires constructing a new system from the ground up to incorporate current technology standards.
   • Pros: Organizations have the total ability to create a modern system that addresses current requirements.
   • Cons: High costs, long timelines.
5. Replacing
   The optimal strategy for certain scenarios involves fully substituting the legacy system with an entirely new solution.
   • Pros: Provides an opportunity to begin anew with a system specifically designed for current and modern requirements.
   • Cons: High upfront costs, and potential disruption during implementation.
6. Refactoring
   Legacy system code is rewritten during refactoring to enhance performance and extend operational lifespan.
   • Pros: Improves performance without a complete rebuild.
   • Cons: Can be complex and time-consuming.

Why It Matters

Different approaches provide unique benefits and meet varied business requirements. Selecting the optimal strategy requires an assessment of the available budget along with the project timeline and existing system complexity.

Next blog: Ensuring Security and Compliance During Legacy Software Modernization