Table of contents


The four criteria and key questions for identifying suitable UX methods

The most common UX methods in a nutshell

UX methods sorted by phase in the product development process

Summary of the key steps for selecting methods

Continue reading online or download the eBook as a PDF:

A guide to identifying appropriate UX methods

This kit offers concise guidelines to quickly assess the general suitability of UX methods for your research project. It contains a printable diagram with established research methods for each product development phase and a UX methods sheet with descriptions, strengths and weaknesses, and areas of application.

Download now


For some user researchers, involving both customers and users in a user-centred development process and creating the best user experience possible for a given product is already a reality. For others, it remains a difficult task. It is understandable that for many user researchers, the path to the right UX method is not always immediately clear. This is due to the large number of often complex UX methods.

This guide offers concise guidelines to quickly assess the general suitability of UX methods for your research project. As such, this guide contains a brief description of the most common UX methods in a condensed form. It summarises their typical areas of application, special features, strengths and weaknesses.

You will also learn about the four key selection criteria and core questions to quickly and easily identify appropriate UX methods. Which UX methods are appropriate at which stage of the product development process? And what type of results can you generate?

In addition to this guide, you will also receive as a bonus:

  • a printable chart showing the different phases in the product development process. This includes the four criteria for identifying suitable UX methods.
  • a printable spreadsheet of UX methods. It clearly summarises the typical areas of application and strengths and weaknesses of the respective methods.

Happy reading!

The four criteria and key questions for identifying suitable UX methods

Which research methods are most suitable for generating the most useful insights within UX projects? It’s a good question, and a seemingly difficult one at that. Essentially, identification of suitable UX methods is based on four simple criteria and core questions that build on each other:

The four most important criteria and core questions

  • Phase in the development process – Where am I currently?
  • Formulation of question – What is it that I want to find out?
  • Goals and project results – What type and depth of knowledge do I need?
  • Qualitative vs. quantitative – Which methods deliver the best insights?

Phase in the product development process

The first crucial factor is the phase of the product development process in which you are currently – because not every research method is suitable for every stage. So ask yourself at the very beginning: ‘What stage am I at right now?’ Are you in the idea, concept or design phase for the new development of a digital product? Or are you in the process of maintaining an already launched product and want to optimise it?

The four phases of the product development process

Formulating the question

After you have identified the current phase of the product development process, the second key question follows: What exactly am I trying to find out? Let’s assume that you already have a number of hypotheses about user needs or usability for your product. These hypotheses will ultimately lead to specific questions.

Example questions for each phase of product development

Exampe Questions identifying appropriate UX methods
Note: The more specifically your hypothesis-driven questions are defined, the easier it will be to assign suitable UX methods to your project.

Goals & project results

What exactly would you like to achieve with your research project or product development in general? Do you want to understand the needs of your users better and develop personas for a better collective insight? Do you want to explore the market potential of a new product or business idea to minimise innovation risks? Would you like to find out how you can use the strengths of your relevant competitors to your advantage?

The possibilities are endless. Think about where you want the path to lead you.

Qualitative vs. quantitative UX methods

If you have hypothesis-driven, specific questions based on your goals and your current phase in the product development process, you are almost ready to start assessing the suitability of UX methods for your project. But first, we will discuss why and how a distinction is made between qualitative and quantitative methods.

The main differences between qualitative and quantitative UX methods are the observation methods, the type and extent of user researcher influence, and the type of insights and results generated.

In addition, some UX methods can be considered hybrid since they have both qualitative and quantitative properties. Depending on the focus of the research, qualitative and quantitative methods can also be combined; e.g. to validate knowledge gained about the behaviour of users (qualitative) with reliable figures and data (quantitative).

Direct comparison of the characteristics of qualitative and quantitative UX methods:

Sample sizeFairly small sample size (approx. 10-50 participants)Larger sample size for statistically reliable results (from 50 participants)
Type of observationDirect observation of behaviour by a UX researcherIndirect observation through data acquisition and analysis tools
Direct influence by a UX researcherThe UX researcher can ask the user questions at any time during application of the method.The UX researcher cannot ask the user any questions during application
of the method.
Type of findingsAnswers the ‘why’; i.e. the reasons behind the behaviour that leads to a certain effect.Answers the ‘what/how much/how often/how large/how strongly’; i.e. the efficiency areas and the degree of efficiency.
Type of resultsBehavioural analysis (needs, motivators, concerns, problems etc.)Hard numbers and data
Data analysisNot mathematicalMathematical analyses
UX methodsIn-depth interviews Focus groups Field studies Expert review Lab usability testOnline surveys Virtual eye tracking A/B testing Click tracking and analysis


Hybrid methods
Online/crowd usability test, Card sorting, Diary studies

The most common UX methods – in a nutshell

In-depth interviews

In-depth interviews are individual discussions with members of the target group. They are used to reveal users’ core needs, motivating factors and concerns, which in turn can be used to derive the added value of the product/tool and the concept and design requirements.

Areas of useUnderstand, describe and become acquainted with the user. Create personas and customer journey maps. Define use cases, scenarios, define touchpoints, MVP requirements, assess market potential.
Special featureCan be done in person, by phone or video call.
StrengthsThrough targeted questioning, it is possible to gain a deep understanding of the person, their motives, problems and challenges.
WeaknessesDemands a high level of interview skill on the part of the UX researcher. No validity due to the low number of interviews (additional statistical validation required).

Focus groups

Focus groups are moderated discussions with up to 10 participants; their aim is to obtain a variety of user opinions on a particular subject. In order to better evaluate the results, the discussions are recorded with a video camera and/or a note-taker.

Areas of useUnderstanding, describing and becoming acquainted with the user. Creating personas and customer journey maps. Defining use cases, scenarios, customer journey, defining touchpoints, MVP requirements. Assessing market potential.
Special featureParticularly suitable for studies in the early idea/analysis phase in order to gain insights into the required features of the product.
StrengthsUses group dynamics to creatively generate new perspectives, opinions and ideas.
WeaknessesIndividual opinions can get lost in the group; group gravitates towards the opinion leaders.

Online surveys

Participants complete an individually tailored questionnaire online. Online surveys are suitable for quantification and validation of qualitative study results, for example. The statistical data enables a precise description and comparison of the target groups on the basis of mean values, proportions, correlations, etc. Differences between groups can be tested for statistical significance.

Areas of useValidate hypotheses, test advertising effectiveness.
Special featureCan be carried out at any location and across all devices (desktop and mobile), immediate availability of data, diverse analysis options.
StrengthsProvides statistically reliable results, allows explorative analysis, insights about sub-groups, relatively fast results.
WeaknessesNot so suitable for generating hypotheses.

Diary studies

These are long-term studies in which participants record their thoughts, opinions, attitudes and needs about the use of a product in everyday situations. Diary studies provide the opportunity to record changes in usage behaviour over time.

Areas of useRecord of the long-term use and optimisation potential of a product.
Special featureRecord of changes in usage patterns over time.
StrengthsCaptures information on usage habits and changes in usage.
WeaknessesRequires a comparatively large amount of time and effort.

Field studies

The UX researcher observes directly how users and customers search for, try out, buy and use the product under real conditions. Among other things, field studies allow detection of undiscovered innovation potential, thus establishing decisive competitive advantages.

Areas of useTesting and evaluating physical products to optimise the user experience.
Special featureFind, use and buy a physical product; e.g. in a retail shop.
StrengthsCaptures real, authentic user experiences.
WeaknessesDuring covert observation, subjects may feel observed
and behave differently.

Card sorting

Card sorting is useful for the redesign and optimisation of navigation structures to ensure that relevant content from online shops, websites, apps and software can be found quickly. Test users define the top navigation category and optimise the names of the navigation options, grouping related options together. The result is a navigation structure that is understandable from the user’s point of view, which improves the user experience.

Areas of useDevelopment of user-friendly navigation for websites, online shops, apps and software.
Special featureMaps the users’ mental category and concept systems.
StrengthsPossible to combine qualitative and quantitative data. Requires only a small number of users.
WeaknessesWithout card sorting software, documentation and evaluation of the results is very time-consuming. Online card sorting makes the evaluation easier, but there is no way to observe the behaviour of participants or clarify comprehension questions.

Expert review

In an expert review, usability experts analyse websites and apps using established usability and design principles in order to identify weaknesses and to discover potential for optimisation. Usability experts use their knowledge to provide specific solutions for optimisation or redevelopment of the product.

Areas of use‘When usability tests are not possible. Suitable for complex user interfaces.’
Special featureDelivers comprehensive analyses of all relevant conversion factors, such as design, content, usability, etc.
StrengthsCombines the use-case-driven use of the interface with the experience and expertise of UX experts.
WeaknessesNo ‘real’ user feedback. Some usability problems will be found only by real users; thus, combination with a usability test with test users is recommended.

Lab usability test

In a lab test, UX researchers uncover usability problems by directly observing and questioning users. The client can follow the test from an observation room. When combined with eye tracking, it also reveals which areas of websites or apps attract the most attention.

Areas of useTest interfaces, products, prototypes, designs.
Special featureCan be easily combined with eye tracking.
StrengthsHolistic observation of users and their behaviour. Users’ problems are better understood through targeted enquiries.
WeaknessesArtificial usage environment in which users may behave differently.

Online/crowd usability test

Participants test online shops, websites, apps, etc., directly from home in their natural environment. The screen and the voice of the user thinking out loud are recorded via a tool to uncover weak points and potential for optimisation in the user experience.

Areas of useTest prototypes and user interfaces (websites and apps).
Special feature‘Up to 90% cheaper than traditional lab usability tests with the same results.’
StrengthsNatural usage environment. Recordings can be accessed online at any time for subsequent viewing. Large sample sizes possible.
WeaknessesCompared with a lab usability test, no influence or direct query is possible during execution of the online usability test.

Lab eye tracking

Laboratory eye tracking measures users’ eye movements to determine whether relevant messages and interaction elements are perceived by users or whether unimportant elements distract from important ones. Eye tracking is often combined with a classic lab usability test.

Areas of useFor determining which elements are seen in the interface and receive the most attention.
Special featureShows whether important elements are adequately perceived.
StrengthsAllows detailed analysis of eye movement and behaviour.
WeaknessesEye tracking alone does not allow conclusions to be drawn as to WHY a respondent has or has not seen an element on the screen. Evaluating the results is very time-consuming.

Virtual eye tracking

Unlike laboratory eye tracking, which is much more complex, the results of virtual eye tracking are simulated by modern software tools. The results obtained after a few seconds are accurate to over 90% compared with laboratory eye tracking, and therefore represent a cost-effective alternative.

Areas of useLanding page and home page tests.
Special featureShows the visual perception and attention during
the first seconds.
StrengthsResults are equivalent to a lab eye-tracking study. Cheaper
than eye tracking in a lab.
WeaknessesThe results from virtual eye tracking are meaningful only for landing pages and home pages. Analysing scrolling behaviour and the corresponding eye movement
is rather difficult.

A/B testing

In A/B testing, also known as split testing, two or more variants of a website or tool are tested against each other to identify the version that performs best. However, in order to obtain valid results, a lot of traffic or a large group of respondents is required.

Areas of useConversion rate optimisation, testing of interface variants.
Special featureEnables an increase in conversion or turnover with the same volume of traffic.
StrengthsQuantitatively measures the behaviour and behavioural preferences of users. Statistically sound results. Can be valued on a monetary basis.
Weaknesses‘Does not provide any insight into WHY users behave, just how they behave.’

UX methods sorted by phase in the product development process

Diagram of UX methods

Now, you have a good overview of the areas of application and the strengths and weaknesses of the most common UX methods. The following diagram shows the different methods broken down according to their suitability for each phase in the product development process.

In-depth interviews identifying appropriate UX metjods

Download the eBook so you always have a reference work:

A guide to identifying appropriate UX methods

This kit offers concise guidelines to quickly assess the general suitability of UX methods for your research project. It contains a printable diagram with established research methods for each product development phase and a UX methods sheet with descriptions, strengths and weaknesses, and areas of application.

Download now

Summary of the key steps for selecting methods

Finally, let’s review the four key criteria and questions that you can use to identify suitable UX methods for your project.

  • Product development phase – Where am I currently?
    Make yourself aware of which phase you are in. The phase will help you start to narrow down the UX methods you need to consider.
  • Formulating the question – What is it that I want to find out?
    Define your hypothesis-driven questions as specifically as possible to further narrow down suitable UX methods for your project.
  • Goals & project results – What kind and depth of knowledge do I need?
    Make yourself aware of what exactly you want to achieve with the research project or product development.
  • Qualitative vs. quantitative – Which methods provide the best insights?
    Consult the method overview to see which observation methodology, and which type and extent of UX researcher influence generates which insights.

Of course, some real-world experience is also needed to select the right methods for your UX project quickly and reliably. But even with limited experience, an examination of these four criteria and core questions will make selecting suitable UX methods in your everyday project work much easier.