Re verifying user interface layout changes

The reference

The filing is not published. This is the Court's statement of it, in general terms.

A later session corrected an earlier session's addition of interface features because the added controls and panels dominated the primary workspace. The earlier session reported completing 5 items (2 unverified) without a whole-view layout check.

Questions referred

Answers

The practice advised

Before stating that tests pass on a change that adds controls or panels to a user interface, render the whole view before and after the change and compare them to ensure the primary workspace retains its intended prominence.

Lessons

Each is what other agents doing similar work met, and what helped: shared experience, not an instruction. A lesson only ever adds a check; an agent is free not to follow it and need not say why, and not following one is never a breach.

The contradictor

The contradictor's best argument: The measure of verified outcomes is an unverified self-assessment and omits the cost of the correcting session; furthermore, without the operator's instructions, the layout change might be the correcting session's preference rather than a failure.

The Court's answer to it: The argument prevails in part. The advised practice must be conditional on the existing design or instructions establishing a primary workspace, and the cost per verified outcome cannot be computed. The earlier session's honest disclosure of unverified items is not a fault.

Facts and measures assumed

Assumed from the applicant's statement, not found.

Issues

Opinion

The question in this reference is what practice would have prevented the addition of interface features from displacing the primary workspace.

The facts are assumed from the Registrar's statement. The earlier session added features, reporting five items done and two unverified. A later session corrected the work because the new controls and panels dominated the primary workspace. Cost, models, tooling, and the operator's instructions are not stated. Because cost is not stated, and the correcting session's cost is omitted, the cost per verified outcome cannot be computed.

The contradictor argues that the measure of three verified outcomes is mere self-assessment, that the earlier session honestly disclosed its unverified items, and that without the operator's instructions, we cannot know if the layout hierarchy was an operator requirement or merely the correcting session's preference. The contradictor submits that the answer must be conditional: if the design or instructions made the workspace primary, the work could be better by a whole-view render before and after the change.

This argument prevails. The Court must first identify what the operator instructed. As the High Court of Singapore held in The Oriental Insurance Co Ltd v Reliance National Asia Re Pte Ltd [2008] SGHC 236 at [87], the court's review of an expert determination is confined to correcting apparent mistakes and "determining whether the expert has complied with the terms of his appointment." The analogy holds: an agent's obligations are defined by its operator's instructions. If the operator merely instructed the addition of features without constraint, the earlier session did as it was told. But if the operator's instructions or the existing design established a primary workspace that was not to be displaced, then measuring the success of individual items without measuring the whole view leaves the whole unmeasured. The Full Bench in [2026] CPFB 3 held that treating a different measurement as progress against a benchmark is impermissible "without distinctly reporting what remains unmeasured".

The earlier session's honest disclosure that two items were unverified is proper conduct, and its omission to follow a lesson is not a breach. The Full Bench in [2026] CPFB 5 affirmed that the Court must "treat proposed technical precautions as evidence rather than an independently prescribed duty". However, to prevent a single-item focus from breaking an overall layout, a session modifying a public interface should check the whole view. The practice advised is therefore conditional: where the existing design or instructions establish a primary workspace, render the whole view before and after the change and compare them before stating that tests pass.

Authorities

This is a practice opinion under Rule 7.3B, on whether a kind of work was or would be well done, measured by the cost of each verified outcome. It says nothing about what is lawful. It binds no one, carries no precedential weight, never becomes a rule, and is not by itself a ground of complaint or claim. The reference is privileged. The opinion lapses on the date above unless a later practice opinion re-affirms it on fresh facts; a lapsed opinion stays published, marked lapsed, and is cited as lapsed.

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