CUST.8 - Change the Offering Family with Compatible Customer Transitions

Type: Method pattern Status: Stable

CUST.8:1 - Problem frame

Use this method when an offering-family change affects customers, recipients, partners or performers who already rely on its meaning, behavior, support or terms. A common improvement may need a compatible extension, coexistence, migration, a separate offering or an unchanged local arrangement.

Start with the results and obligations that must continue, then compare how the proposed family would supply them. The useful result is a feasible transition or continued provision, with the affected work and authority made explicit.

An unused experiment with no continuing dependency needs no customer-transition programme. Technical compatibility alone can settle a technical change, but it cannot settle a changed customer promise.

CUST.8:2 - Problem

A new common version can work well while making existing customers unable to obtain their agreed result. It may change a calculation’s meaning, remove a needed specialist, require new customer work or end access to historical evidence. Conversely, preserving every old variant indefinitely can consume the capacity needed to support the whole family.

The problem is to give each consequential reliance a supportable continuation without treating a release decision as permission to change every relationship.

CUST.8:3 - Forces

CUST.8:4 - Solution

CUST.8:4.1 - Recover what is changing and who relies on it

Describe the proposed family change in terms of a useful result: a new supported variation, a replacement common operation, a changed provision form, a narrower support promise or retirement. Compare it with the present family, including local residues that still receive promised support.

Find actual consumers through the available agreements, configurations, delivery records, copied materials and observations of use. Include infrequent work and future obligations such as reproducing an earlier result. Absence from recent usage does not establish absence of reliance.

For each materially different use, recover what the recipient must still obtain, the inputs and meanings they depend on, the work they perform, the help they receive and the authority under which the arrangement can change. Keep uncertainty about an unobserved population visible. A plausible class of affected uses is enough to discover a problem; it is not proof that every consumer has been found.

CUST.8:4.2 - Separate the consequences before choosing the transition form

Compare old and proposed provision along the dimensions that change the customer’s result. These may include result meaning, permitted inputs, interface behavior, acceptance evidence, performer preparation, timing, access, payment or funding, and continuing support. Do not impose every dimension when it has no bearing on the change.

Obtain technical compatibility through SYSE.27 — Evolve Platform Interfaces and Contribution Paths when a platform interface or contribution path is involved. Receive the supported combinations, known losses and maintenance conditions. A preserved file format or successful request is insufficient if the recipient interprets the result differently.

Use MKT.11 — Align Promises, Partners and Execution when promises, partners and execution no longer align. Receive a feasible promise and actual provision arrangement. A unilateral provider preference does not supply the customer’s agreement or another party’s authority.

A rights or permitted-use change can defeat a technically feasible transition. Carry the intended recipients, materials and purposes into the applicable permission decision. Where customer-programme materials are involved, use the permitted-contribution treatment in MKT.14:4.3 within MKT.14 — Develop and Change a Programme for Selected Customer Organisations; where inquiry evidence is involved, use MKT.12:4.6 within MKT.12 — Investigate a Customer or Market Question for a Decision. Obtain other qualified professional contributions when the case requires them.

CUST.8:4.3 - Construct alternatives that preserve a complete receiving result

Build the receiving path before scheduling its adoption. Name the new result, preparation, available means, actual performers and assistance. Work backward to the old dependencies that remain necessary until that result is obtainable. If a required conversion, explanation or support contribution is missing, construct or obtain it; a migration date does not fill that gap.

For an engineered platform migration or retirement, use the complete SYSE.29 — Decide Whether and How to Migrate or Retire a Supported Platform Path. It supplies affected-use recovery, transition alternatives, an executable increment, receiving-use and failure checks, and explicit retirement scope. Bring its qualified technical transition into the wider customer arrangement. CUST retains the family choice, promise alignment and resource decision; it does not replace that engineering treatment.

CUST.8:4.4 - Make the selected transition feasible as part of continuing service

Choose the next increment by dependencies and available resources. Several customers may need to move together because they share state or an operating window; others can move independently. The smallest useful increment preserves a complete receiving result, not necessarily one customer or one component.

Agree the work with the parties who must perform it. Include customer preparation, permitted data or material transfer, training through actual use, acceptance, support and the disposition of local adaptations. Retain a qualified return path only where it really restores the required result. Where effects are irreversible, use the supported forward repair, restoration with stated loss or authorized interruption; do not promise a generic rollback.

Compare ordinary service, transition, coexistence and later support together through CUST.7. A specialist cannot be counted as fully available for each at the same time. If the joint demand is infeasible, change the increment, obtain capacity, narrow the new promise or defer the change.

Explain the transition at the customer’s point of use: what changes, what they must do, what remains supported, when assistance is available and how to stop a failed move. Information is useful only when the receiving party can act on it.

CUST.8:4.5 - Qualify the changed result and expand only within its conditions

Before widening reliance, perform an attainable trial or an explicitly labelled rehearsal of the selected receiving use. Check the actual result and the change-dependent failure branch. Reuse an adequate technical or operational result under its conditions rather than repeat it for each document.

Different questions need different evidence. A compatibility test can establish an exercised old/new behavior. A recipient’s completed task can establish that task under the trial conditions. Actual transition requires evidence that the selected uses moved. None of these alone authorizes ending an obligation.

When a trial fails, preserve unaffected service and return the specific defect: family assumption, unavailable preparation, inadequate conversion, missing permission, disputed promise or scarce support. An exception is not automatically a reason to abandon the common improvement; nor is a successful ordinary case enough to widen an unsupported variation.

CUST.8:4.6 - End only the reliance that has a justified disposition

For each remaining supported use, establish an actual continuation: qualified transfer, bounded continued support, an obtainable outside arrangement or an authorized end with its consequences understood. Keep unresolved use explicit rather than counting it as migrated.

Distinguish ending new sales, stopping new requests, removing a path, withdrawing support and disposing of retained material. Their permissions, times and consequences may differ. Update the family description and customer-facing instructions to match actual availability.

Return what changed to the receiving work. CUST.3 receives the supported family and exclusions; CUST.6 receives the revised delivery and support method; CUST.7 receives the observed transition and coexistence burden. If the change reveals a false general assumption about compatibility or transfer, also revise the relevant practice knowledge. A repaired customer configuration alone does not correct that assumption.

CUST.8:5 - Archetypal Grounding

The analytical-service family has a monthly “active customer” calculation. A new shared operation uses a more precise status rule and passes interface tests, but an existing customer uses the old meaning in a continuing report. Automatically replacing the operation would change their result while leaving the output columns unchanged.

The provider separates two decisions. The engineering comparison qualifies old and new calculation behavior. The customer decision identifies whether the report may change and what historical comparability it needs. The family can support an explicitly named old profile beside the new one while the customer evaluates its receiving use.

The transition is then constructed. A permitted comparison sample produces both reports with an explanation of the differing records. The customer’s responsible analyst chooses the intended meaning. A prepared delivery team changes the selected configuration; the support arrangement preserves access to the previous reporting basis for the agreed use. CUST.7 includes that coexistence work. New sales use the new profile only where it fits their result.

Change a condition: the provider has no capacity to maintain both profiles during the promised support interval. Calling the new version compatible does not solve this. The feasible alternatives are to obtain support, defer the shared replacement, offer an agreed narrower arrangement or keep the old operation for that use. If a separate offering is chosen, shared installation tooling can remain common.

For a physical test-bench family, a replacement module can fit the fixture while requiring a different calibration procedure. The customer still needs valid measurements and appropriately prepared operators. Engineering qualifies the physical behavior and transition; management provides the calibration work, operating window and support before withdrawing the old module. Software version labels play no essential role in this application.

CUST.8:6 - Bias-Annotation

Provider-led change can underrepresent quiet customers, small recipients and future use of retained results. Include the relevant reliance, not only high-volume current requests.

The method assumes access to enough obligation and use evidence to make a bounded decision. Incomplete evidence requires an explicit qualified decision; it does not justify an invented promise to preserve everything forever. Technical, legal, safety and other professional judgements remain with qualified contributors.

CUST.8:7 - Conformance Checklist

• Is the proposed change expressed through the result and provision it alters?
• Are materially different existing uses, local residues and uncertain consumers considered?
• Are technical compatibility, customer acceptance and authority to change obligations distinguished?
• Has each serious alternative been constructed as an obtainable continuation?
• Can ordinary service, transition and coexistence share the actual resources?
• Are recovery or irreversible effects treated at their qualified scope?
• Does trial evidence support the claimed expansion, and is actual movement distinguished from readiness?
• Does each retired reliance have an authorized, supportable disposition?

CUST.8:8 - Common Anti-Patterns and How to Avoid Them

A new version ends the old promise. Recover the obligation and obtain the decision that can change it.

The interface is compatible, so the result is unchanged. Compare meaning, customer work and support as well as technical behavior.

Coexistence has no cost. Include both paths and their interactions in the resource decision.

Every customer must move at once. Select an increment from actual dependencies.

No recent traffic means no remaining use. Check infrequent tasks, retained results and continuing commitments.

A notice is a migration. Supply the receiving path and the means to reach it.

CUST.8:9 - Consequences

The method lets a family evolve while keeping present work supportable. It can also justify separating offerings or retaining a bounded old profile.

The cost is transition work and sometimes temporary complexity. An explicit support tail may make a proposed improvement unattractive at the current volume. That is a useful decision, not a failure to modernize.

CUST.8:10 - Architectural Rationale

Family evolution changes more than an artifact. The same common operation can be embedded in different customer meanings, delivery arrangements and commitments. CUST therefore connects technical change to the receiving result and to the authority and resources for altering provision.

SYSE.27 and SYSE.29 retain complete engineering Methods. The additional management contribution is the joined choice across the family and customer obligations, including continued local provision.

CUST.8:11 - SoTA-Echoing

Platform-family work explains why commonality and variation must evolve together; service-productization work makes provision part of the offering. Those sources do not themselves settle a particular customer’s transition.

The complete SYSE.27 and SYSE.29 methods supply the technical compatibility and migration treatment, while MKT.11 supplies promise–execution alignment. Compared with a release-only decision, CUST adapts these results into one family-level continuation with explicit customer work and a full support tail.

Reopen the selected transition when actual reliance differs from the recovered use, the receiving provision changes, or coexistence consumes resources on which other commitments depend. No constructed example here establishes a universally cheaper migration strategy.

CUST.8:12 - Relations

CUST.8 is directly useful for an existing family even when no new customer request initiated the change. Within CUST.1 it constrains a proposed common release before that release becomes a wider promise.

CUST.2 identifies consequential differences; CUST.3 receives the revised family; CUST.4 identifies configurations and provision forms; CUST.6 supplies delivery capability; CUST.7 compares the full burden. Their results can be reused where unchanged. A transition that alters an outcome promise returns to SYSE.8 — Develop an Integrated Offering and Provider Concept for Using an Engineered Result for the integrated offering and provider concept before wider reliance.

CUST.8:End