HMI Design Best Practices: The Ultimate Guide to Optimized Human-Machine Interfaces

Get ahead in HMI design with actionable tips and insightful time-tested strategies.

It’s the age of HMI (Human-Machine Interface), where intuitive dashboards and touch screens facilitate effective communication between humans and machines.

HMI typically refers to screens or dashboard designs that convey information, data, and metrics through graphics or visual representations of numbers. HMI screen design plays an important role here, determining how clearly operators can understand and interact with that information.

Operators( users)oversee and manage equipment and processes in factories and plants through these screens. So, HMIs play a crucial role in modern manufacturing processes, enabling efficient, safe, and reliable operation of complex machinery.

By 2028, the HMI technology market is projected to reach USD 7.7 billion, reflecting increasing adoption of industrial automation in process and discrete industries. 

As industries increasingly rely on HMI technology to enhance operational efficiency, reduce labor costs, and improve productivity, the importance of thoughtful human machine interface design becomes evident. 

In this article, we discuss some important aspects of HMI design with a specific thrust on HMI UI/UX design best practices. 

What is HMI Design?

HMI design refers to the creation of intuitive and user-friendly interfaces that facilitate interaction between humans and machines in various applications. These interfaces typically utilize visual elements, such as graphics, icons, and touchscreens, to convey information and enable control of machinery, equipment, or systems.

Good HMI design principles help ensure that these interactions remain clear, predictable, and easy to understand.

Here are some HMI design examples based on the areas of application:

• Touchscreen control panels in manufacturing plants allow operators to monitor and adjust production parameters with simple gestures.
• Dashboard displays in automotive vehicles present vital information such as speed, fuel level, and navigation instructions in a clear and accessible manner.
• Smartphone apps for smart home devices enable users to remotely control lighting, temperature, and security systems with a few taps on their mobile device.
• ATM interface guide users through banking transactions with easy-to-understand menus and prompts.
• Medical device interfaces in healthcare settings provide clinicians with real-time data and controls for patient monitoring and treatment.
• Pilots navigate, communicate, and monitor aircraft status using HMIs in aircraft, ensuring safe and efficient flight operations.

Evidently, there is a diverse array of HMI-based systems across various industries. While different industries may require unique functionalities and layouts for their systems, at their core, the fundamental principles of good design persist. Adhering to best practices in HMI design is critical for success and effectively reducing human errors.

Your system handles critical operations daily. But is your interface designed to prevent costly operator errors under pressure? → Explore our HMI UI UX Design Services. 

Here Are the 10 HMI Design Best Practices You Need to Know 

Design plays a major role in the effectiveness of HMI systems. A well-designed HMI is intuitive, user-friendly, and caters to the specific needs of the industrial process. With a clear and concise display of information, ease of control system, and prompt communication with operators, these goals are achieved. Reducing this operator workload helps users to maintain focus in high-pressure environments. 

What are some HMI design best practices that can reduce the cognitive load and boost operator performance? Let’s take a look. 

#1. Reduce Cognitive Load by Giving Data Context 

The first glance should tell the operator what is happening. That is where cognitive load becomes important. Every number, alert, button, and visual cue takes a tiny slice of attention. When too much lands on the screen at once, the operator has to work harder to figure out what deserves attention. 

Human factors experts design interfaces to make information easier to process, reducing overload and confusion when the stakes are high. Dr. Mica Endsley, P.E., breaks down the process into three steps:

• Perceiving: What is happening?
• Understanding: What does it mean?
• Predicting: What could happen next?

Good HMI design principles supports all three. Information needs to be organized logically, critical data needs to stand out, and related functions need to stay together. 

Take a simple temperature reading. Showing 82°C tells the operator what the temperature is. Showing 82°C alongside its normal range, warning threshold, and recent trend gives the operator a much better idea of where the process stands and whether something needs attention. 

That same thinking belongs in HMI screen design. Put information where operators naturally look for it and keep related functions together. Use placement, formatting, and visual cues to make critical conditions easy to spot.

The truck weighing station interface shown here follows that thinking. Inspected truck data and violation information are presented together, giving the operator a quick read of what matters.

Want to go deeper into how operator workload gets measured and managed on real industrial screens? Read our full guide on Operator Workload and HMI Design

#2 Ease Navigation to Guide Operators with Precision 

Clutter-free navigation within an HMI system ensures swift and intuitive access to desired functionalities for the operators. For this, focus on the user journey and think from users’ shoes. Operators should know where to go, what to press, and how to get back without stopping to decode the interface. The best navigation follows the operator’s workflow, keeps routine actions close, and makes the next step easy to anticipate. 

A few simple rules keep the journey clean:

• Keep essential buttons consistent: Put controls such as Home, Main Screen, Back, and Alarm in the same place on every screen.
• Keep screens close: Aim to keep every screen within two or three clicks of the main screen.
• Design around real tasks: Organize the layout around what operators actually do, not a long list of system features.
• Keep frequent functions handy: Put commonly used actions front and center and move rarely used functions deeper into the interface.

Then test the navigation with real operators. Watch where people pause, search, hesitate, backtrack, or take an unexpected route. Those moments are often the clearest clues about what needs fixing.

Your screens display all the metrics. But are they helping your operators prevent costly downtime? Find out what’s slowing them down. It’s free → Explore our HMI UI UX Services

#3 Wisely Choose Colors and Fonts

Color and typography in an HMI are there to help operators see, understand, and act. They are working tools. The choice of colors and fonts holds significant sway over usability and readability. 

Here’s how to make wise selections:

• Keep the palette tight: Save bright, attention-grabbing colors for alarms, warnings, and abnormal conditions.
• Give colors a consistent meaning: If red means danger on one screen, it should mean the same thing everywhere else.
• Choose fonts for real conditions: Text should remain readable from a distance, in poor lighting, and when operators are working under pressure.
• Design for changing light: Make sure the display remains comfortable and legible across bright daylight, low light, and dim night-shift conditions.

Got curious about playing with color? Learn the psychology behind it and how color can become a purposeful actor in industrial HMI design. Dive into our blog on The Psychology Behind HMI Color Coding

#4 Include Graphics Strategically 

Graphics can speak faster than words, especially when operators need to understand a situation at a glance. They can break language barriers and make important information easier to recognize. 

Looking back at the Truck Weighing Station interface, the visual cues help operators make sense of the data without having to dig through a wall of text. But there is a catch: adding more graphics does not automatically make an HMI better. Oversized visuals, busy screens, and complicated animations can slow things down and pull attention away from the job at hand. Use graphics where they genuinely help, keep them lightweight, and give the important information room to breathe.

Want to see how graphics, visual hierarchy, and data presentation work together in real-time HMI UX design? Take a peek at our Real-Time HMI Displays: UX Best Practices 

#5 Adhere to HMI Design International Standards 

When designing an HMI interface, it is crucial to adhere to international standards to ensure usability and efficiency. In HMI UI/UX design, ISO 9241-110: Ergonomics of human-system interaction – Part 110 Dialogue principles provides the general principles and guidelines. 

Here are some key points from the standards:

• General Appearance and Behavior: The interface should include buttons, saliences, and dialog boxes. These objects can be selectable or non-selectable, with selectable objects initiating actions.
• Button Design: Buttons should be large enough for easy selection on touchscreens, with a recommended minimum size of approximately 1.5 cm on the shortest side. Button behavior can be momentary or two-state, with clear visual indicators for the selected state.
• Saliences: Colored or textured saliences should be used to indicate the condition of buttons and other objects, such as alarms or required user attention.
• Dialog Boxes: Dialog boxes are used for supplemental information, user input, or error reporting. They should include a title bar, display area, and window control buttons (e.g., OK, Cancel).
• Navigation Model: The basic network navigation model should minimize user actions and time. It has to allow users to move horizontally between different sections of the panel without the need to navigate up and down menus. 
• Display Layout: The basic layout includes four panels—title, information, command, and navigation. If the panels are tiled edge to edge, the  interface should support left-hand orientation for the command panel.
• Title Panel: The title panel should contain essential information such as host communications status, date/time, current view name, and optional elements like corporate identifiers or logos.

For a closer look, explore the full mapping of the standard in our HMI Design Ethical Considerations Guide.

#6 Implement Error Prevention and Safe Interaction Design

A well-crafted HMI UX design should minimize the risk of operator errors and ensure safety in high-risk environments such as industrial automation, medical devices, and aerospace.

Beyond usability, HMI design principles also carries ethical considerations that protect users, prevent errors, and promote trust. When operators know that the interface has been thoughtfully designed to safeguard against mistakes, they can engage with the system more confidently and focus on their tasks without fear of unintended consequences.

Best HMI UI/UX Practices for Error Prevention:

• Use Confirmation Prompts: Prevent accidental actions by prompting users before executing critical commands.
• Error Feedback & Recovery: Provide clear, actionable messages to guide users in case of an error.
• Prioritize Critical Controls: Design touchpoints and buttons to prevent unintended activation (e.g., emergency stop buttons should be distinct and easily accessible).
• Highlight System Status in Real Time: Use color-coded alerts and animated indicators to ensure operators always have situational awareness.

These practices reflect the essence of human machine interface design thinking, where usability principles are applied to safeguard high-stakes environments. One of the notable HMI design examples is that of aviation HMI screens, in which users could see a confirmation dialog that prevents pilots from unintentionally shutting off essential flight systems.

More on this in the HMI Design Thinking for Mission-Critical UX 

Your industrial system gets the job done. But is its interface meeting modern ISO safety and UX standards? See how your panels stack up. It’s free → Check our HMI UX Audit Service. 

#7 Prioritize Accessibility and Inclusivity in HMI UX Design 

Operators come from diverse backgrounds, with different physical abilities, cognitive skills, and environmental conditions affecting their interaction with an HMI system. A well-designed accessible interface ensures all users can navigate it efficiently.

Key Accessibility Considerations for HMI UX/UI design:

• Use High-Contrast Visuals: Design for color-blind users by ensuring adequate contrast between critical elements.
• Enable Text Scaling: Allow users to adjust font sizes for better readability.
• Alternative Input Methods: Incorporate keyboard navigation, voice commands, and haptic feedback for users with mobility impairments.
• Design for Low-Light & High-Glare Environments: Implement dark mode options and adaptive brightness for different working conditions.

For example, Factory floor HMIs often have adaptive contrast displays to remain visible under extreme lighting conditions.

Take a scoop of extra insight from  our guide to the psychology behind HMI color coding and see how accessibility in HMI UI/UX design can make interfaces clearer, safer, and easier to act on. 

#8 Optimize HMI Systems for Multi-Device & Multi-Platform Use 

Modern HMI screen designs are no longer confined to single-screen terminals. With cloud computing and IoT integration, operators need multi-device access to critical data across various platforms.

How to Optimize HMI for Multi-Device Usability:

• Use Responsive UI Design: Ensure the interface scales well across desktop monitors, tablets, and mobile devices.
• Enable Remote Monitoring: Design cloud-based HMIs that allow operators to access dashboards from anywhere.
• Ensure Consistent UI Elements: Maintain uniformity by applying HMI design principles consistently across platforms to reduce the learning curve.
• Optimize for Touch & Gesture Controls: Since operators may switch between touchscreens, keyboards, and styluses, ensure input adaptability.

Industrial automation companies like Siemens and Rockwell Automation are the best HMI design examples that use cross-platform HMI screens to allow operators to monitor equipment remotely via tablets.

Want to see how UX fits into the wider manufacturing ecosystem? Take a closer look at our Manufacturing UX Design guide for more ideas on designing better experiences across industrial workflows. 

#9 Design for Scalability and Future-Proofing 

As technology evolves, industrial HMI designs must remain adaptable to new hardware, software updates, and process changes. A scalable HMI design reduces the need for frequent redesigns and enhances long-term usability.

Best Practices for Scalable HMI UX Design:

• Modular UI Components: Use customizable widgets that can be easily updated as system requirements change.
• Support for Future Integrations: Ensure API compatibility with IoT devices, AI-driven analytics, and automation tools.
• Adaptable User Roles: Design role-based interfaces where different users (e.g., supervisors vs. operators) see only relevant controls.
• Flexible Data Representation: Allow users to customize dashboard design layouts to display the most relevant metrics.

SCADA systems in manufacturing use modular HMI dashboards that allow engineers to integrate new sensors, machines, and automation controls without requiring a full redesign.

#10 Ensure Efficient Data Visualization and Decision Support 

The primary goal of HMI dashboards is to provide actionable insights in real time. Well-structured data visualization can reduce decision-making time and improve operator efficiency.

How to Improve Data Visualization in HMI UX:

• Use Intuitive Graphs & Charts: Instead of raw numbers, present trends using line graphs, bar charts, and heatmaps.
• Apply Predictive Analytics: Use AI-driven dashboards that highlight potential failures before they occur.
• Ensure Logical Information Hierarchy: Display the most critical data first, with drill-down options for deeper insights.
• Leverage Color Coding & Animations: Use flashing alerts and color cues to indicate urgent changes in system performance.

Automotive HMIs in electric vehicles (EVs) use interactive energy flow diagrams to show real-time power distribution across battery systems.

Real HMI Design Examples Shaping Everyday Industries: Beyond the Screen

HMI design is not merely screens and buttons, it’s about taking complicated data and making it clear, stress-free, and making it confident, and taking action and making it outcomes. Done well, HMI UX design becomes an unseen partner, helping users navigate decisions in high-risk environments without overloading them. Let’s explore some real-world HMI design examples that demonstrate just how strong and varied HMI design can be across industries.

1. Automotive Industry – Tesla and BMW iDrive

Tesla has arguably remade the electric vehicle user experience by putting HMI front and center in its car interiors. The big middle touchscreen doesn’t merely manage the radio or air conditioning; it provides drivers with access to things like vehicle diagnostics, navigation, and energy usage, all via a sleek, context-sensitive UI. It adjusts dynamically with driving mode, road type, or even user preference. No clutter. Simply smart, adaptive design.

BMW’s iDrive system, however, combines tactile controls with digital menus. Rotary knobs, voice commands, or gesture control can be used to drive the system by the driver. The menu is designed in a layered form so that necessary functions are never far from reach, thereby reducing distraction and improving road safety.

For a deeper dive into this domain, see our detailed article on HMI design principles in automotive UX

2. Industrial Automation – Siemens SIMATIC HMI Panels

In factory floors where seconds count, and machinery conditions are everything, Siemens SIMATIC HMI panels impose order over chaos. Their interfaces enable the operators to scan production lines, identify glitches, and execute instructions in real time. Color-coded statuses, escalated error levels, and instantaneous feedback are favored when designing their arrangements to limit operator errors. For example, a machine overheat isn’t simply indicated as a red icon, it includes historic temperature charts, maintenance recommendations, and a guided shutdown process, all on the same panel.

3. Aviation – Boeing 787 Dreamliner Cockpit

Aviation pilots are constantly pressured to make accurate decisions at cruise altitudes. The Boeing 787 Dreamliner cockpit demonstrates a breakthrough in HMI with its “glass cockpit” design. Conventional analog dials are substituted by dynamic, high-resolution screens that change according to flight stages, takeoff, cruise, and landing. Instead of displaying all information simultaneously, the interface focuses on filtering and prioritizing data. Weather alerts, fuel levels, airspeed, and engine performance appear as necessary, eliminating mental overload for long-haul flights.

The result is an example of human machine interface design built around decision-making, situational awareness, and controlled information flow.

4. Healthcare – Philips IntelliVue Monitors

In hospital ICUs, nurses depend on timely, precise data to meet patient needs. Philips IntelliVue patient monitors are engineered with multi-layered, hierarchical views of data. Real-time vital signs are displayed, but more crucially, the interface can identify critical conditions and initiate alerts with intelligent visual feedback, flashing signals, color-coded graphs, and soft alarms that differentiate levels of urgency. This HMI design enables quick response without risking information overload. It is a good example of how thoughtful HMI UI/UX design can support fast decisions without overwhelming the person using it.

5. Smart Buildings – Schneider Electric’s EcoStruxure

New smart buildings employ advanced HMI dashboards such as Schneider Electric’s EcoStruxure Building Operation. Facility managers can monitor HVAC efficiency, lighting use, energy use, and occupancy patterns, all from one integrated digital platform. The interface employs interactive floor maps, heatmaps, and energy trendlines to provide actionable information. If a conference room is using more energy than it usually does, the HMI not only notifies the user but also provides historical comparisons and recommendations for corrective action.

6. Food & Beverage – Coca-Cola’s Automated Bottling Line

Operators in Coca-Cola’s high-rate bottling facilities watch thousands of bottles pass by each minute. In these facilities, HMI systems with SCADA interfaces graphically represent the whole bottling process. They are capable of monitoring deviations in pressure, temperature, or cap positioning—each of them graphically depicted on a flow diagram. Real-time warnings enable personnel to identify the precise position of a fault without stopping production altogether.

7. Semiconductor Manufacturing – SmartFactory Unified Process Control

In semiconductor manufacturing, HMI systems must cope with some of the most demanding conditions in industry, nanometer-level precision, strict cleanroom protocols, and thousands of process variables running simultaneously. SmartFactory’s Unified Process Control (UPC) platform is a real-time example of this. It consolidates data from etching, deposition, and inspection tools into unified dashboards where operators can track wafer status, chamber conditions, and alarms in a single view. By presenting traceability metrics and performance trends clearly, the HMI enables engineers to spot deviations early, prevent contamination or misprocessing, and protect multi-million-dollar production lots. 

📍For a detailed look at how HMIs are designed and applied in semiconductor manufacturing, explore our Complete Guide to HMI Design in Semiconductor Manufacturing.

Maximize HMI Efficiency Through Thoughtful Design 

A well-executed HMI UX design is crucial for optimizing operator performance and overall system functionality. Users prioritize three key attributes in a product: speed, reliability, and ease of use. By adhering to the best design practices outlined here, these objectives can be effectively realized. 

As a leading UI UX design company, we have expertise in HMI UX UI design services and these design practices are drawn from our experience. Failure to prioritize design may lead to under featured HMI systems, ultimately resulting in increased expenditure and user dissatisfaction over time.

If you have any queries, don’t hesitate to reach out to us! Let us prepare a detailed chart for your HMI design needs.

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