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Welcome to JustSmile!


  1. Our Project
  2. Living Lab Method
  3. IoT Design Principles
  4. Fleisch Formula

1 Our project

Embedded Feedback System

Description: Like/Dislike systems from social networks should be embedded into the real world. Previous implementations copy the function with the help of simple buttons. For instance:

Problem: Usage of different devices; everyday routine is interrupted by operating the feedback system. This does not occur in social media, because interaction takes place in the same medium, e.g. on a website. With the help of the Living Lab process, we want to develop concepts for an IoT-based feedback system that is more deeply embedded in the real world.

The Living Lab Method is a systematic, user-centered research method to develop new ideas, concepts, products or services. This Method consists of four phases: Co-Creation, Exploration, Experimentation and Evaluation. In the Co-Creation phase not only users of the future solution but also other stakeholders participate by developing personas, value propositions, business models, user story maps, etc. In the Exploration phase an Exploration Test Set Up and Instructions on how to use the solution are explained. In the Experimentation phase hypothesis are formulated and in the Evaluation phase these hypothesis are confirmed or rejected.

Project members and their responsibilities:

  • Katja Rapp: Personas, Value Proposition Canvas, Lean Canvas, Story Telling Canvas, Fleisch Formula, Video.

  • Felix Augenstein: Personas, Value Proposition Canvas, Communication Behaviour, Exploration Test Set Up, Hypotheses, Data collection, Next steps, Fleisch Formula, Video.

  • Jean-Michel Taverne: Prototype: How it works, How to use our prototype, Technical implementation, Fleisch Formula, Video.

  • Timo Schr├Ągle: Value Driver, Product Vision Board, User Story Map (MVP), Design Principles, Fleisch Formula, Video.

Video of our MVP To watch the video please click here.

2 Living Lab Method

1. Co-Creation

2. Exploration

3. Experimentation

4. Evaluation


3 IoT Design Principles

IoT (Internet of Things) describes devices that contain sensors or communication technologies which are integrated into an environment. IoT devices are not perceived by the user as an ordinary "computer". They are "intelligent" objects "things", which independently recognize the user's situation and react on it.

For the development of IoT devices with the associated services and applications some design principles should be considered. These ensure that the usual requirements for IoT devices are observed. Some of these design principles are explained in more detail below.


An IoT device is embedded if it is not recognized as a stand-alone device or computer. In fact, the IoT device integrates itself into an existing environment or object without demanding the user's attention.


IoT applications should be invisible to the user. To do this, the technology must work in the background without the user operating the object.


This principle in a way contradicts the already described principle of invisibility. It specifies that the system status of the IoT device must be visible and traceable for the user at all times.

Manual Override

The user must be able to manipulate the device at any time, overwriting the automatic settings of the device. Manual intervention by the user must therefore be detected and performed by the system at all times.

4 Fleisch Formula