The user experience design (or UX design or design for User eXperience) impacts the appropriation of the Internet of Things. This variable is reflected in the model developed by Zeling Zhong , a doctoral student in the Chair. Indeed, a successful user experience is one of the keys to the appropriation of these new objects and services in our daily lives. It is important to go into this axis in depth particularly when we notice that more than one third of connected objects are abandoned definitively by their user before only 6 months of use. 
However, the user experience design for the Internet of Things is more complex than the limited design to a simple web service. Hardware part adds additional constraints difficult to change post-production, contrary to Software part wich can always be changed retrospectively via an up-to-date. Therefore, it is essential to think and designer upstream the entire connected object.
Why User Experience Design for Internet of Things is so different ?
As it is explained by Claire Rowland , a specialist in UX design for the Internet of Things (IoT), a designer of connected objects must require a holistic approach. Focus on tangible parts, as industrial design part of the object or the User Interfaces (UIs) design, is not enough. These last two elements have an undeniable impact, and even major impact, on the final user experience. However, many other layers of the design of a connected object must be taken into account. Claire Rowland offers a Framework for IoT Design (cf. Figure 1) that’s give us a good view of the whole picture.
Internet of Things : a complex ecosystem
The cartography « I MAKE THINGS » (cf. Figure 2) d’Alexandra Deschamps-Sonsino , expert in strategy and IoT design, shows us that creative industries never stop to overlap. The Internet of Things involves a multitude of players with varied visions. In this environment, physical and virtual world meet. Software, hardware and any service associated to the connected object must be complementary. Therefore, Designers, Engineers and Business need to have a common understanding of the objectives in order to deliver a coherent experience to the end user.
The differentiating features of a connected object
A connected objects maker must keep in mind three characteristics that make these objects so special:
- Their ability to make the bridge between the physical and digital world (cf. Figure 3)
- The fact that most of the connected objects are part of a multi-device system
- Constraints and opportunities involved by their networking
The interusability : what does it mean ?
As it just has been mentioned, the majority of connected objects are often part of multi-device systems.
The functionalities can be distributed across multiple devices with different capabilities. One of the missions of the designer is to examine the best way to distribute these functionnalities. Thus, he, or she, will design the UIs and the interactions across the entire system. We must not forget that the processing of data collected through this system often leads to the creation of an online service. This service should also be thought, designed and integrated by enablers to the entire system.
To keep in mind : “The whole system experience is often equally or more important than any single device UX.” C. Rowland
Design the UX as a whole
And that’s not all, after Interusability there is the Conceptual Model and behind the Platform, the Service and the Productisation  (cf. Figure 1).
- The Conceptual Model: what are the user’s expectations towards the system? what is his overall view of the system?
- The Platform: essential for managing the complexity of these multi-devices systems.
- The Service: a connected object is rarely a “one-shot sale”. It is often combined with a service involving an ongoing relationship with the maker.
- The Productisation: the fact of turning a concept or a technology into a marketable product. In other words, succeed in creating an obvious value proposal for the target audience.
With all these facets, we understand better why it is so tempting to “forget” some of these layers in the design of a connected product. As aptly stated by Alexandra Deschamps-Sonsino :
“[…] that’s the trouble of the internet of things, there are too many touch points that need designing so we start with the easiest: the screen.”
To keep in mind : we must not be satisfied with designing only the tangible parts of a connected object, as the screen and User Interfaces part. IoT product has to be considered as a whole.
Getting out of the glass slabs standard
Into the “Terminal Worlds” era, where smartphones and tablets prevail, it is quite difficult to get out of this glass slabs standard. However, the range of possibilities offered by connected objects is huge. It would be unfortunate to limite ourselves only to the screen as a medium for information. Designers, such as David Rose, are working on these trajectories. This professor of the MIT Media Lab, and serial entrepreneur from the Silicon Valley, develops connected objects similar to magical objects from our stories and our collective imagination. 
To conclude and to insist on this last point, we invite you to watch the TED conference of Tom Uglow, creative director at Google, who explores what might look like an Internet without screen. He explains especially that our Happy Places are built of simple natural solutions which come to serve our need for information. Internet, where the screen would be less present, than it is now might be one of the solutions to make Internet most joyful and human.
Please note that this article is only a first approach of the complex world of IoT User Experience Design. We are currently in a kick-off phase to lead an extensive study on this topic inside the Chair.
 Zeling Zhong, phD student in the SOSN Chair, is currently working, in the context of her thesis, on the adoption and appropriation factors of connected object. She conceives a model to explain the variables of IoT Technology Acceptance Model.
 Source : study led by GfK (2014)
 Claire Rowland is a UX product expert, specialized particularly in IoT. She is the lead author of Designing Connected Products (2015), which has everything to become a reference in IoT product design oriented user. You can read the first glimpse of her work on this free access report: Designing the Internet of Things : Why It’s More Than UI and Industrial Design (2015) written by Claire Rowland and Martin Charlier.
 We will come back in a specific article on the trajectories developed by David Rose. In the meanwhile, we recommend you to read his book: Enchanted Objects : Innovation, Design and The Future of Technology (2014).