First, give conclusions that can be used for decision-making
The old system often contains hidden business rules and historical data accumulated over the years, and rewriting teams can easily reproduce only visible pages, leaving out unusual and exceptional processes. The assessment should distinguish between stable modules that still have value, high-risk modules that limit innovation and redundant features that can be downloaded. Through API sealing, database bypasses, modular replacements and front-end updates, technological debt can be progressively reduced while maintaining operations.
What conditions need to be identified before judgement is made?
The same question may have different answers under different business, data and project phases. It is suggested that the following conditions be checked and that the common findings on the web be incorporated into their own projects.
Suggested order of advance
First, we'll be clear about the target and the border.
Completion of asset, architecture, data, interface and business value diagnostics.
Validation Key Dependence
Core process regression tests are established to protect correct behaviour.
Development of assessable outcomes
Select to replace the low-coup high-value module first and design the old and new data synchronization.
Make sure you decide the next step with the real results.
Switch users and traffic by stage, verify and then retire from old modules.
How do you understand it in the actual business?
The old ERP interface of the enterprise is old but orders and financial rules are stable, and new mobile and analytical platforms can be built first through the exposure of core competencies at the service level; and the maintenance of difficult inventory modules can be replaced in step. This improves user experience and avoids a single rewriting of all rules leading to disruption of business.
The easiest pit to step on.
The rewrite was decided only because of the old technology. No business risk calculated.
New systems were developed for several years before a one-time switch continued to change requirements
A large number of shadows and manual double-recordings remain after migration is completed
How should we end up receiving and confirming?
Each migration phase should check functional equivalence, data consistency, performance, security, monitoring and regression. Ultimately, old access, recovery privileges, archived data and updated transport documents should be closed to avoid “new and old” becoming a permanent burden.
When preparing to communicate with suppliers or internal teams, it is recommended that current processes, representative samples, existing systems, planning time and budget levels be brought. First, the unknown items are clearly marked, and then the decision is made to use diagnostics, PoC, fixed-range projects or ongoing research and development, which is usually more reliable than a direct demand for a price and duration without borders.