# Page Publishing: inspect the experiment behind the headline | Marketfield Index

> A multilingual campaign raises questions about mobile forms and measurement.

Source: https://globalagenciesindex.com/cases/page-publishing/
Language: en
Source review date: 2026-09-11

Case analysis

A multilingual campaign raises questions about mobile forms and measurement.

Agency-reported work; source checked on 11 September 2026.

## The original task

Black Propeller describes search campaigns for English- and Spanish-speaking authors and expansion to additional countries.

## Work described by the agency

The source reports intent and regional segmentation and a comparison of multi-step and embedded forms.

## Editorial interpretation: what to apply

Request the experimental definition, sample and stopping rule before using an uplift in procurement. Compare mobile task completion and submitted-record quality. Detailed case narratives still need arithmetic and methodology checks; ask the same questions of every candidate.

## Data and applicability limits

The source contains an unclear significance statement and inconsistent numerical descriptions. We do not reproduce the uplift as a reliable causal estimate; request the underlying counts.

## Before using this example in a brief

- Request the starting conditions and the agency’s precise contribution.

- Ask which materials and process can be demonstrated for your audience.

- Define an acceptance test that does not depend on repeating a headline result.

[Black Propeller](https://globalagenciesindex.com/agencies/black-propeller/)

## Source and reading context

The linked publication supports the factual example or technical context. The checklist and commissioning advice are editorial interpretation.

[Read the original source](https://blackpropeller.com/results/page-publishing/)

### Related work

[Google Ads](https://globalagenciesindex.com/services/google-ads/) [Conversion rate optimization](https://globalagenciesindex.com/services/conversion-rate-optimization/) [Website development](https://globalagenciesindex.com/services/website-development/) [Back to the library](https://globalagenciesindex.com/cases/)

## Primary sources

- [https://blackpropeller.com/results/page-publishing/](https://blackpropeller.com/results/page-publishing/)