UX vs. Product Design vs. UI: The Never-Ending Battle

Digital product design teams are often referred to as “the UX team” or “the UX/UI team,” which are terminologies that can significantly disturb a proper understanding of what UX and digital product design actually are and what a digital product design team does. For one, the user’s experience can’t be designed in the first place, and “doing UX” goes way beyond the scope of digital product design. For another, saying “UX/UI” isn’t meaningful since they’re neither the same nor separable concepts within a process; one can’t “do UI” without also “doing UX.” Generally speaking, digital product design covers design research, interaction design, and visual design, and it’s a much more accurate term for what’s commonly referred to as “UX” or “UX/UI.” We believe a proper understanding of terminology is essential for being able to deliver one’s best possible work as a designer.

“We Need to Get Rid of Significance in A/B Testing, Seriously!” Published in ACM interactions

The way A/B testing is done in many—if not most—companies today, p-values and significance are pretty much meaningless. Still, decision models often only allow treatments to be implemented if they achieved a "significant uplift". One better alternative is to employ a Bayesian approach which allows to report probabilities for minimum uplifts and to calculate ROI on a case-by-case basis.

User Experience Is an Elusive Thing, or Conversion Rate & Average Order Value Are Not UX Metrics!

In this article, I review six metrics commonly used to measure UX: conversion rate (CR), average order value (AOV), task success rate, time on task, Net Promoter Score® (NPS), and the System Usability Scale (SUS). CR, AOV, and NPS do not fulfil the definition of a UX metric while task success rate, time on task, and SUS do. Still, none of the metrics (alone) is suitable to reliably measure the UX of a digital product.

Creating Medium-Fidelity Prototypes for AR/VR Experiences

Prototyping in 3D isn't the same as in just two dimensions. Compared to regular, flat websites, augmented and virtual reality have very different requirements when it comes to creating prototypes. To close a gap in the medium-fidelity range of AR/VR prototyping methods, we've created 360theater, which makes use of dioramas and 360° content for creating physical-digital prototypes. We've used our new method in workshops with design students and found that it comes close to the final experience while complementing other methods with different levels of fidelity.

My Ultimate List of Books You Need to Read If You Want to Truly Understand Digital Design: A Work in Progress

This list contains the books I believe everyone who wants to truly understand what digital design is all about needs to read. I've tried to roughly categorize them into more foundational topics and then somewhat along the double diamond: finding the right problem and finding the right solution. To provide a glimpse into the future, I also list some books on designing for an with (a selection of) novel types of interfaces.

“Growth Marketing Considered Harmful” Published in i-com

I'm proud that my article "Growth Marketing Considered Harmful" has been published in the latest issue of i-com ‒ Journal of Interactive Media. Abstract: In today’s e-commerce industry, conversion rate optimization is often considered essentially the same as user experience optimization. In addition, there is a strong focus on quantitative experimentation, which some deem a… Continue reading “Growth Marketing Considered Harmful” Published in i-com

KPI-Centered Design

Despite evidence that employing a human-centered design (HCD) approach to product design yields a strong competitive edge, many companies neglect HCD or don't even consider it in the first place. One reason for that is probably that many who think they're working user-centered are practicing something entirely different: KPI-Centered Design. This article inquires into different forms of design processes, into the differences between proper HCD and KPI-Centered Design, and how a resonable compromise can look like: Formulating hypotheses based on evidence rather than just KPIs or gut feeling, and complementing quantitative experimentation with more qualitative insights.

5 Foolproof Conversion Rate Optimizations for Your E-commerce Business

When hearing conversion rate optimization, many think of the application of psychological principles such as social proof or scarcity. But before employing those, e-commerce businesses first have to get their fundamentals down—which many don't. In this article, I present five foolproof (and proven) ways to optimize your conversion rate: optimizing your checkout, getting rid of shipping costs (as much as possible), focusing on usability, getting rid of dark patterns, and gaining a deep understanding of your customers.

Herr Keller und die “umweltfeindlichen” Umweltspuren

Der neue Düsseldorfer OB Keller bezeichnet die Umweltspuren in der Stadt als "umweltfeindlich" und möchte sie daher abschaffen, obwohl ihre Wirkung durch ein wissenschaftliches Gutachten belegt ist. In diesem Artikel analysiere ich die Antworten des Rathauses auf meine Anfrage nach Belegen für Herrn Kellers Behauptungen. Das Fazit: Sie entbehren jeglicher Grundlage und es konnten keinerlei Fakten präsentiert werden. Stattdessen wird deutlich, dass Herr Keller die Umweltspuren lediglich abschaffen möchte, weil sie seiner Klientel ‒ Pendlern mit Benziner oder Dieselauto ‒ unbequem sind.