Portability and Exit Plan

Portability is the ability to move data, configuration, and a working process to a different environment or supplier with their meaning intact. An exit plan describes how the organization would do that if the supplier, model, price, or need changes, and what it would cost in time and money. GOV.UK describes lock-in as a situation where switching is difficult, time-consuming, and disproportionately expensive, and advises including estimated exit costs and time in the business case.

Decide what must move before the export button is tested

For an invoice-evidence lookup, the list includes the clerks’ annotations, links back to source records, identifiers, the relationships between orders and receipts, permission settings, audit history, and the retrieval behavior that users have come to rely on. An export file proves only that some data leaves. A sample import into a different environment checks whether identifiers, links, and permissions survive and whether the records can still be found.

Open formats help with data and reduce lock-in; they do not carry proprietary features, ranking behavior, or a supplier’s permission model. Those either have to be rebuilt or consciously given up, and the plan should say which.

Exit is a requirement with an owner and a test

Write it like any other requirement: what must be exportable, in which documented format, verified by a sample transfer, judged by the data owner. Some lock-in may be accepted in exchange for faster delivery, as GOV.UK notes, but that is a decision to record rather than an accident to discover later. Contract terms belong to the same plan; GOV.UK’s purchasing guidance suggests a break clause at a maximum of two years where economic, so that leaving is possible without disproportionate cost.

Revisit the plan when the supplier changes its formats or prices, when the organization’s need changes, or when a rebuild elsewhere would be cheaper. An untested exit plan is an assumption.

References: GOV.UK: Managing technical lock-in in the cloud, GOV.UK: Define your purchasing strategy. Examples here are illustrative.