Legacy System Testing


Established applications or systems that continue to yield “good enough” business results can look pretty attractive against the cost of updating those solutions, often with investment returns that can take years to realize. But the “dark side” of legacy systems looms large for companies that resist modernity. In an industry evolving at digital speed, ten-plus-year-old technology may still get you where you need to go, but like an aging car, the resources you need to keep it running grow scarcer by the day. Pyramid’s legacy system testing solution addresses the keystone challenge of testing and diagnosing these systems. Then with a clear view to the critical needs of legacy systems, applications, and processes, we can bring targeted solutions that ensure maximum up time for strategic assets that, though dated, remain critical to business’s bottom lines.


A legacy system is an established method, technology, computer system, or application program. The term legacy can also describe an old or outdated method or system, often one deployed alongside more modern solutions. Today, legacy systems of all kinds remain in use in many businesses, and the essential task of testing this aging technology is growing more complex and challenging by the day.

Problem or Challenge

Over time, legacy systems become more fragile as physical infrastructures decay, licensed support evaporates, and the human expertise needed to maintain the technology disappears (through retirement, attrition, etc.). What’s more, security updates and patches may be difficult or impossible to come by, and integration with modern systems suffers from divergent technologies that do not accommodate legacy implementations. The following issues are just a few that make legacy system testing challenging at best:

  • Complex, undocumented architectures with unknown defect levels
  • Time constraints for development and QA cycles
  • Large numbers of test cases/scenarios
  • Large number of changes
  • Distributed and diverse legacy applications
  • Large number of QA resources required
  • Lack of documentation

Pyramid Legacy Systems Testing Solutions (LSTS)

Pyramid’s LSTS custom testing strategy addresses many of the challenges organizations face when testing legacy systems. Our experienced QA designers create customized, automated tests that are manually implemented from the outside in. Customer interactions are preserved through automated tests while internal implementation testing is delayed until the appropriate time. The right time for testing internal behavior is during defect resolution. Our strategy is a quick fix and becomes proactive with legacy systems.