Introduction

When designing user interfaces for systems meant to be used by large, diverse groups of people in semi-public settings, it is crucial to strike a balance between ease of use and functionality. Such systems often require interfaces that are intuitive and can be understood by individuals who have limited time to familiarize themselves with the device. This article explores several real-world examples of user interfaces designed for concurrent use by multiple anonymous and unsophisticated users.

ATMs and POS Systems

Automated Teller Machines (ATMs) and Customer-Facing Point of Sale (POS) systems are prime examples of this design philosophy. These systems must be user-friendly and easily understood by anyone who wishes to use them, regardless of their technical sophistication. The interface is typically straightforward, with well-defined buttons and options that are easily accessible and understandable. This intuitive design ensures that users can complete their transactions quickly without needing extensive training.

Vending Machines

Vending machines present another scenario where user interfaces need to be simple and self-explanatory. These devices are often found in public spaces and require users to make a selection quickly and accurately. The typical design includes a touchscreen or button interface that shows images of available items, along with simple buttons to make selections. The positive feedback loops, such as confirmation sounds or lights, also enhance user interaction and satisfaction.

Apartment Building Intercom Systems

In apartment buildings, intercom systems can vary in design, but they generally aim to be user-friendly. In some Dutch buildings, rows of doorbells with multiple buttons allow residents to call different apartments. This design, while requiring more buttons, can be less confusing if it is consistent and logical. In contrast, US buildings might use a telephone-based system with a numeric keypad to select an apartment. While this design saves space, it can become more challenging when multiple individuals use it.

Public Transit Buttons

Buttons on public transit vehicles and stations often serve the dual purpose of alerting drivers or train operators and signaling to passengers that a stop is requested. These interfaces are typically simple and clear, using basic pictograms and text to indicate functions. For instance, a button with an icon of a bus stop can be recognized by most users, regardless of their level of familiarity with the specific vehicle.

Toilets and Faucets

Public toilets and taps in washrooms often follow a standardized design to ensure ease of use for all users. In many public places, hot water taps are placed on the left, and cold water taps on the right, with right-hand thread requirements for the handles. Similar standards apply to faucet design, making it easier for users to find the correct function without confusion.

Hospitality Room Appliances

Hotel and short-term rental room appliances, such as thermostats, heaters/AC, and coffee makers, are designed with the same principles in mind. These interfaces are often simple and intuitive, allowing guests to easily adjust the temperature, control the heating or cooling systems, and prepare coffee. The systems are usually pre-set to a default comfortable state, requiring minimal user interaction.

Payphones and Ticket Machines

Payphones and transit ticket machines are also important examples of shared user interfaces. Payphones, while becoming less common due to mobile technology, still use simple and straightforward interfaces, often with a one-digit number keypad and a dialing screen. Transit ticket machines, common in subway stations and airports, feature clearly labeled buttons and screens that guide users through the process of purchasing tickets or accessing passes.

Internet-based Interfaces

The internet provides countless examples of user interfaces designed for multiple users in semi-public settings, such as web-based services and applications. These interfaces are often user-friendly and can operate on various devices, ranging from smartphones to desktop computers. They are designed to be intuitive, with clear navigation and user-friendly prompts to guide users through their tasks.

Conclusion

Designing user interfaces for ephemeral use by multiple users in semi-public settings requires careful consideration of ease of use, functionality, and user experience. Whether it be ATMs, vending machines, or public transit buttons, these systems must be straightforward and self-explanatory to ensure that users can operate them quickly and without frustration. By adhering to these principles, designers can create interfaces that are accessible to all users, regardless of their technical proficiency.