Aristotle said it and it is still true: there’s no real knowledge without ethics

 

This article is part of our Learning research and innovation series, offered by Coorpacademy in association with the EPFL’s (Federal Institute of Technology of Lausanne, Switzerland) LEARN Center. The authors are Jessica Dehler Zufferey, Executive Director of LEARN and Roland Tormey, Coordinator of EPFL Teaching Support Center.

When reflecting on your lifelong learning journey, you probably contemplate on which training you would like to take, what knowledge you might lack, and which of your learning habits are sub-optimal. In some moments, you might even find yourself thinking about what “knowledge” really is; is it being up-to-date with the latest flow of information? Is it having accumulated expertise in a specific domain through experiences? Is it our general level of education? Or could it be something else?

Three types of knowledge

In Ancient Greece at the dawn of scientific knowledge, Aristotle distinguished three types of knowledge. (1) 

  1. Epistème refers to the understanding of the world and the universally true reason of why something is. Today, we would talk about this as scientific and theoretical knowledge.
  2. Technè applies and uses this scientific knowledge, most of the times in order to achieve something. While epistème allows to understand the world, technè is about acting on the world. (2)
  3. Phronêsis, the third type, takes the reflection one step further.  Not only is theory applied in action, but phronêsis adds the consideration of the ethical implications of the proposed  action. Some have translated it as prudence, but not in the sense of hesitant application, but rather practical wisdom or sagacity and the capacity to distinguish good from bad action in day to day life. It seems easy to consider phronêsis as a necessary ingredient of knowledge, when we remind ourselves that not all application of scientific knowledge was and is ethically optimal. 

These ancient concepts continue to bubble through in contemporary social and human sciences research too. Jonathan Haidt (3), a social psychologist at the University of Virginia, has explored the way in which our actions are often driven by emotions and instincts rather than by rationality. Much of our ethical behaviour is, he argues, driven by ‘moral emotions’ like compassion, gratitude, contempt and anger, rather than by ‘moral reasoning’ as it is traditionally conceptualized. For those who think of themselves as rational people, his research is eye-opening in the way it demonstrates the typical cognitive bias in ethical decisions:  they are taken very quickly and driven by emotion, with our rational mind being used to justify the decision after the fact. Cultivating the aptitude to live ethically then requires more than developing our rational selves. Developing phronêsis – practical wisdom – will require emotional as well as intellectual work, it seems.  

Are we there yet in our current education models?

Of the three types of knowledge identified by Aristotle, epistème, related to science & theoretical  knowledge, is the most teachable. Universal laws can be explained and demonstrated to learners. In turn, technè builds on epistème. The identification of possibilities to apply that theoretical knowledge can be trained for example by experiential learning. Most of our learning, at school, at university, in apprenticeship and in corporate workplace learning is of the first or second type. Instructional designers often try to optimize the learning experience in order to facilitate the transfer from epistème to technè, i.e. the application of theoretical and conceptual knowledge.

However, phronêsis cannot be taught independently of the other two. It is considered to grow naturally with experience. However, the opposite might be happening. François Taddei reports in his recent book Apprendre au XXIe siècle (4) how the consideration of ethical implications can drop with growing levels of expertise and education. He refers to a 2011 study showing that the number of years of medical studies was negatively correlated with empathy (the dimension of ethical considerations addressed in this study). Similar results are reported for management students who seem to lose their collaborative attitude over the course of their studies. Our own studies with engineering students have found that their levels of moral reasoning may decline as they study. (5)

Many call for a more integrated view on education that integrates all three types of knowledge. For example, the French national engineering accreditation body CTI (Commission of Engineers Titles) included the capacity to identify ethical responsibilities as an essential criterion for any training of engineers. (6) (If at this point, you want to analyse the capacity of practical judgement in your organisation, you could apply the inventory on ethical climate for example). 

A training program addressing all three types of knowledge

Research suggests that training of phronêsis should not be implemented as pure philosophical courses on ethical reasoning. Criteria for success are for instance cognitive engagement through complex dilemmas with diverse potential decisions, emotional relation with realistic rather than dramatic case studies, and integration in subject-matter courses. 

Take computer science education as an example. In this field, there has long been a focus on teaching computer science (the epistème part of it) and/or ICT (Information and Communication Technology) usage (the technè part of it). Only recently, and probably due to the general awareness about the digital transformation of all aspects of life and society, the analysis of the impact of digital technology on the world was included as an essential ingredient. The German Society for computer science, for instance, has declared in 2016 that digital education needs to include three questions

  1. How does digital technology work? 
  2. How do I use it? 
  3. How does digital technology impact the world?

In order to educate on the third question in our current projects on, more generally, computational thinking education, we sought for inspiration from the latest thinking in a quite new domain called sociology of digital technology (the most recent and complete view was presented by Dominique Boullier). Different perspectives are used in order to analyse the impact of digital technology on many levels: 

Cognitive science and psychology help to analyse the impact on ones behaviour and thinking as a user of digital technology; 

Social psychology and sociology support the evaluation of impact on interpersonal relations, social groups and society; 

Historical comparison allows us to identify the impact on any aspect of life such as work, mobility, communication, security, or health. It can even shed some light on the question of how digital technology might impact the future. 

Why it matters

Today, we see that scientific knowledge and technological evolutions, especially in digital technologies, have an enormous impact on the world. There are few things we now do without digital help, whether it’s explicitly using digital tools, or it’s the algorithms working in the background sometimes without us being aware of them. Our communication patterns have changed dramatically. In parallel, algorithms inside social media platforms recommend us social interactions. Professionals from multiple domains have included digital practices into their working habits. Our consumption is turning more and more towards e-commerce. Our online behaviour is used to advertise products and services more successfully, and the internet of things will expand the data available to improve these recommendation systems further. We should get prepared for more transformations in the future. 

At the same time, we are confronted with incredible challenges, ecological (global warming, access to drinking water, renewable energy, …) and societal (just think of public opinion and democracy in this time of ‘fake news’), that we need to tackle if we want our societies and species to survive.

As a result, it is time to learn to learn again – not only theoretical knowledge and how to use it, but how to make use of it for the betterment of ourselves, of our relations with others, of our society, and our world.

Innovation in Learning Science and Educational Technologies are top of our agenda at Coorpacademy, as we see them as critical to our mission to continuously improve the learning experience on our platform, making it even more personalized, flexible and enjoyable for learners.

Authors EPFL Jessica Dehler Zufferey and Roland Tormey


Sources

(1) Aristotle, Nicomachean Ethics, second edition, translated by Terence Irwin, Indianapolis: Hackett Publishing Co., 1999.

(2) Stanford Encyclopedia of Philosophy. Episteme and Techne. https://plato.stanford.edu/entries/episteme-techne/#3

(3) Haidt, J. (2013) The Righteous Mind: Why Good People are Divided by Politics and Religion. London: Penguin

(4) Taddei, F. (2018). Apprendre au XXIe siècle. Calmann-Lévy

(5) Tormey, R. LeDuc, I., Isaac, S. Hardebolle, C. and Vonechè Cardia, I. (2015) The Formal and Hidden Curricula of Ethics in Engineering Education https://www.sefi.be/wp-content/uploads/2017/09/56039-R.-TORMEY.pdf

(6) CTI https://www.cti-commission.fr/fonds-documentaire/document/25/chapitre/1217

(7) Cullen, J. B., Victor, B., & Bronson, J. W. (1993). The Ethical Climate Questionnaire: An Assessment of its Development and Validity. Psychological Reports, 73(2), 667–674. https://doi.org/10.2466/pr0.1993.73.2.667

(8) German Society for Computer Science, 2016, Dagstuhl-Erklärung.Bildung in der digitalen vernetzten Welt. https://gi.de/fileadmin/GI/Hauptseite/Themen/Dagstuhl-Erkla__rung_2016-03-23.pdf

(9) Dominique Boullier. 2019. Sociologie du numérique. Paris, Armand Colin.

3 Ways Former Google CEO Is Reengaging Workers To Be More Productive – Forbes

 

To be discovered in Forbes, 3 ways Jean-Marc Tassetto, co-founder of Coorpacademy, is reengaging workers to be more productive.

Following the keynote at Gartner ReimagineHR London 2019 where Stéphan Bruno, CHRO of the Principality of Monaco, and Jean-Marc Tassetto presented the partnership with Coorpacademy to retrain 3,600 of Monaco’s public sector employees, Forbes contributor Heidi Lynne Kurter published an article on 3 ways companies can shake up corporate learning to increase productivity, talent retention and engagement with the help of innovative employee learning experiences.

If you want to read the article on Forbes.com, it’s here. 

Or discover extracts of the article here!

3 Ways Former Google CEO Is Reengaging Workers To Be More Productive

[…]

The World Economic Organization recently announced by 2022, 75 million jobs will be destroyed and 133 million will be created as a result of new technologies. Consequently, companies are likely to face resistance in retraining tenured employees who have a limited skill set. Therefore, it’s crucial for them to start preparing employees for change by reopening their appetite for learning and decreasing their fear of the future.

Stéphan Bruno, director of human resources for Principality of Monaco, is determined to be at the forefront of the digital revolution. At the London Gartner ReImagine HR conference, Bruno announced the governments partnership with CoorpAcademy to retrain 3,600 of Monaco’s public sector employees. Known as the Netflix of knowledge and training, CoorpAcademy is an innovative digital e-learning platform that uses gamification to make training interactive and appealing.

[…]

Creating A More Learner-Centric Approach

CoorpAcademy co-founder and former head of Google France, Jean-Marc Tassetto, aims to creatively disrupt traditional e-learning experiences. Instead of imitating Coursera and Udemy by seeking out professors from top universities, Tassetto felt it would be more effective to partner with key industry leaders across the globe. These leaders are entrusted with developing and teaching specific courses relevant to their expertise. For example, Understand Blockchain Technology is a course created by IBM and taught by its current employees.

[…]

Reducing Fear Of The Future

[…]

Both Bruno and Tassetto understand by putting employees in charge of their learning, with guidance from their manager, non-digital natives can increase their digital maturity at a pace that feels comfortable for them. Users also have the opportunity to take advantage of additional content to further develop their skill set. Some courses available to them are feminine leadership, stress management and design thinking, to name a few.

Engaging Through Micro-Learning

A study by Microsoft states on average an individuals attention span lasts 8-seconds. If companies and e-learning platforms want to keep users engaged and on track to complete the course, they need to focus more on mini modules that are short enough to keep their attention. Tassetto states the most successful micro-learning modules typically range from 5-12 minutes in length. Anything longer risks losing the attention of its users. Their micro-learning modules are a healthy mix of asking questions, playing games and keeping players engaged until the end with short form videos.

With clients such as L’oreal, IBM, Nestle and BNP Paribas, the EdTech startup has found great success in their unique and innovate learning approach. By placing learners first, employees are empowered to develop their skills for who they want to be instead of who they are now. Bruno was surprised to see employees at every level of the government sector from gardeners to firemen positively interacting with the platform.”

[…]

Discover the full article here!

Coorpacademy in the Top 15 Performing Learning Technology Platforms for the second year in a row by The Learning and Performance Institute

 

After making it in 2018, we made it again!

We are pleased to announce that we are part of the 2019 Top 15 Performing Learning Technology Platforms unveiled today by The Learning and Performance Institute, the UK’s leading authority on workplace Learning & Development.

It is great recognition – this supports our ambition to be the partner of choice of companies that are willing to implement a continuous learning culture and develop the employability of their employees.

 

The Top 15 report is available here!

Here are some insights from The Learning and Performance Institute website on how these Top 15 highest-performing learning technologies providers have been selected.

What does ‘highest-performing’ mean?

Since 1995, The Learning and Performance Institute has consulted with, evaluated, and mentored thousands of organisations worldwide to help them build internal capability and deliver notable performance improvement. This is done through the LPI’s “Performance Through Learning” programme: a consultative framework that leads to accreditation by prioritizing outcomes over delivery, homing in on the value, efficacy and business impact of learning, and aligning competencies with organisational strategy and goals.

The 15 organisations listed in this eBook have a clear roadmap by which to build their capability and adapt their strategy for continual success. They demonstrate a strong customer value proposition and have a corporate culture that instils confidence throughout sales and marketing, to delivery and after-sales support. They are passionate and committed to developing their staff, their products, their market reach, and their performance.

Prospective and existing customers can be assured that these 15 organisations will provide the highest quality of service and the best user experience. They are trusted business partners, acting always in the best interests of their clients and, as such, fully endorsed by the Learning and Performance Institute.

How are they measured?

During an accreditation assessment, the LPI evaluates organisational efficacy against the following key performance indicators (KPI’s), scoring each against a reference framework.

  • Client Integrity
  • Corporate Integrity & CSR
  • Client Value Proposition
  • Marketing
  • Sales
  • Learning Technologies Consultancy
  • Learning Platforms
  • Learning Authoring Tools
  • Quality Management
  • Service/Product Roadmap
  • Qualifications/Accreditations
  • People Development
  • Business Stability

 

The results of this are fed into a formula that applies weightings to each KPI to generate numbers representing Best Solution, Best Operational Management and Best Overall. This eBook uses the figures from Best Overall.

Discover more here by downloading the eBook!

We are proud at Coorpacademy to be part of the Top 15 Highest-Performing Learning Technologies Providers.

 

Capturing Learner Data

 

“If somebody describes to you the world of the mid-21st century and it sounds like science fiction, it is probably false. But then if somebody describes to you the world of the mid-21st century and it doesn’t sound like science fiction, it is certainly false. We cannot be sure of the specifics, but change itself is the only certainty”, says futurologist and author Yuval Harari.

Change means disruption – and getting ready for change. And HR leaders need to proactively help people develop, adapt and learn new skills as part of this change if they are serious about retaining their competitive advantage.

This article from Jean-Marc Tassetto, co-founder of Coorpacademy, featured in Training Journal in the September edition – the UK’s most influential Learning & Development publication – looks at how the most advanced learning experience platforms are revolutionising the analytical possibilities for L&D professionals. Allowing them in the end to unlock and consider the full potential of their people: a good thing for business and, most of all, for the future of the employees. Discover the article!

Capturing Learner Data

Jean-Marc Tassetto looks at how the most advanced learning experience platforms have revolutionised the analytical possbilitiés for L&D professionals.

It’s no secret that the global workplace is going through a huge transformation. The arrival of automation, connectivity and artificial intelligence is seeing employees increasingly work alongside complet – not always transparent – technological processes.

As futurologist and author Yuval Harari says, the only thing we can be certain of is that our future in uncertain: “If somebody describes to you the world of the mid-21st century and it sounds like science fiction, it is probably false. But then if somebody describes to you the world of the mid-21st century and it doesn’t sound like science fiction, it is certainly false; We cannot be sure of the specifics, but change itself is the only certainty.”

Change means disruption – and getting ready for change. According to a recent survey by global analysts PwC, for example, 80% of CEOs said securing the right skills for the new digital economy is one of their biggest challenges.

The same survey found that 74% of employees are ready to learn new skills or retain to be employable in the future. 

But HR leaders still need to proactively help people develop, adapt and learn new skills as part of this change if they are serious about retaining their competitive advantage. 

But despite all this context of disruption, there is a positive outlook for humans in the job market. By 2022, says the World Economic Forum, emerging occupations are set to increase from 16% to 27% of the employee base of large firms globally, while job roles currently hit by technological obsolescence are set to decrease from 31% to 21%. THe body estimates that 75 million current jobs roles may be displaced by the shift in the division of labour between humans, machines and algorithms – meanwhile 133 million new job roles may emerge at the same time. 

Jobs going? Yes, but jobs are coming. 

In other words, robots are being added to the workplace but so are people – with new and different skills. US staffing giant ManpowerGroup, for example, has stated that it is reskilling people from declining industries such as textiles for jobs in high-growth industries such as cyber security, advanced manufacturing and autonomous driving. 

Growth is also forecast in frontline and customer-facing roles – which all necessitate interpersonal skills such as communication, negotiation, leadership, persuasion, complex problem-solving and adaptability. 

With talent shortages at a 12-year high and new skills emerging as the world gets more connected, companies are also realising they can’t source the skills they want at short notice. ManpowerGroup found that a staggering 84% of organisations expect to be upskilling their workforce by 2020. What would that look like in practice? The World Economic Forum estimates the average employee will need 101 days of retraining and upskilling in the period up to 2022. 

This is no small ask for HR and L&D departments. And while there is unlikely to be a jobs apocalypse in the future, if organisations don’t take the right steps now there will be a drought of skilled talent, which will have a detrimental impact on the bottom line. What we can be sure of is that technological change will necessitate employees continuing the L&D process throughout their careers, requiring strategic lifelong learning plans.

Where is the hard ROI training data?

Supporting such plans will put pressure on organisations to provide comprehensive and imaginative L&D opportunities to fully support us through these changes. That’s not great news at a time when training budgets are being squeezed and the C-suite is demanding to know its return on training investment. So having the right metrics and guidance to show proof of ROI back to stakeholders is now more crucial than ever. Let’s review how important that is. At the Learning Technologies exhibition and conference in February this year, independent HR analyst firm Fosway revealed the first preliminary results of its annual digital learning realities research, and the verdict was not positive: “By not providing hard evidence of how learning is adding value on an individual, team or organisational level, practitioners are missing a huge opportunity to gain recognition of their contribution to the organisation and much-needed investment for future learning,” warned the organisation’s director of research, David Perring. 

Perring went on to detail how only 14% of the UK HR community can say with confidence they are effectively measuring the impact of learning, while around half are doing so, but poorly, and a third are not measuring impact at all. No wonder, when asked to describe the L&D industry’s progress in measuring learning impact, this analyst responded with just one word: “terribly.”

Help may finally be at hand

The good news is that a way of mapping training investment to measurable bottom-line results may be about to become available at last. That’s in the shape of the learning experience platforms (LEPs), recently formalised as a new market category by Gartner, which have started to become increasingly common in L&D work in the past few years. 

Highly user centric in their delivery model and usability, it’s maybe less well understood that the most advances of this class of edtech software has also revolutionised the analytical L&D palette; 

The advanced LEPs in question track learner behaviour and use that data to test what works and what doesn’t, based on a powerful new way of collecting such data – the Experience API or xAPI standard. That’s a really significant step forward because, until very recently, learning analytics only existed in a very basic way. That was because learning management systems (LMSs) managed access and tracked participation of learners, namely the attendee list – but little else. There may in addition be information on e-learning content downloads, task completions and module completion, but the data was thin to say the least. 

xAPI and activity streams

The gamechanger here in these modern LEPs is the new interface, as xAPI allows us to record any learning experience, including informal learning, providing a much richer picture of an individual’s learning path. The Experience API also prevents data from remaining in the confines of your siloed LMS, as it succeeds the older de facto e-learning standard SCORM (the sharable content object reference model) and is capable of correlating job performance data with training data in order to assess training effectiveness.

Let’s make that a bit more concrete. If you look at someone’s Facebook wall, what you are looking at is a series of activity stream statements; and activity streams are gaining traction as a useful way to capture a person’s activity, both on social networks and in the enterprise.

xAPI uses the same format to capture learning experience data, and as we start to aggregate these streams across an enterprise, or even across an entire industry one day, we can start to identify the training paths that lead to the most successful or problematic outcomes, and so what determines the effectiveness of our whole training programme. 

Doing that would enable organisations to glean new insight into what a learner has successfully learned, how they gained this knowledge and which learning approach they chose to follow. This provides opportunities for strong diagnostic values and advance performance indicators, such as curiosity, or resilience – both hugely valuable people metrics. And, of course, this will ultimately aid the workplace learner as he or she becomes aware of what their own data says about their progress and experience, so as to ensure long-term employability. 

This transformative potential of these new indicators is even greater if you consider that World Economic Forum identified reskilling and upskilling of the current workforce as the number-one strategy companies need to embrace in light of our continuing transformation into a knowledge economy. Knowledge, in the Google age, is easily acquired – while curiosity on the other hand seems less ubiquitous, and many commentators believe we need to boost employee curiosity as well as builder greater resilience and adaptability to change. 

In conclusion

Summing up, the demands of the modern workplace mean we now need to move to a far more learner centric model, where classroom training is supported by virtual training, available on demand, wherever and whenever the learner wants to access it. Such learner centric approaches and leading edge xAPI-enabled technology are proven to work – and most importantly, secure high levels of user engagement. 

Together with the benefits this new generation of LEP-derived behavioural learning analytics could bring, this puts training back at the centre stage in business. Exactly where it needs to be to satisfy the growing and diverse skills requirements of a digital future. 

The result: HR and training professionals can finally use multiple data sources to consider the full potential of their people for specific roles within the organisation and business outcomes. And this has got to be a good thing – for the business and, most of all, for the future of the employees.

Jean-Marc Tassetto is co-founder of Coorpacademy and a former head of Google France; Find out more at coorpacademy.com

 

The two-pager on Coorpacademy in the latest special issue of Capital Magazine

“Coorpacademy: the Netflix of knowledge. Say goodbye to boring training! This Franco-Swiss startup is revolutionizing corporate training by putting the user back at the center of a collaborative and playful experience.”

This is how the article from Benjamin Janssens starts in the latest special issue of Capital Magazine. By interviewing Frédérick Bénichou, co-founder of Coorpacademy, he showcases the stand-out factors of the platform, from ‘simplexity’ to the soft skills catalogue, from the ludic and addictive features to the engaging and individualized learning paths.

Discover this article (translated from French):

“When La Redoute definitely went from paper catalogue to focus solely on digital, they had to train their employees on digital culture and tools and on the latest trends of e-commerce. And what better way to do this than through proposing… online training! The retailer chose Coorpacademy to conceive a digital learning branded platform with tailored content meeting their needs. In 6 months, 800 employees were connected on the platform and – most notably – 88% of started courses got completed. Way faster and more efficient than the old ways – when face-to-face training were needed for each and everyone of the employees. 

Moreover, traditional training usually focus on developing ‘hard skills’, technical skills, at the expense of ‘soft skills’, those more human and cross-sectional skills – the ones robots can’t acquire – which are more and more sought after by employers and recruiters. It is with the idea to fill that void that Jean-Marc Tassetto, Arnauld Mitre and Frédérick Bénichou, two former Google executives and one serial web entrepreneur, launched Coorpacademy in 2013. This Franco-Swiss startup, which won a lot of awards since then, started to put together a disruptive pedagogical method  based on soft skills assimilation. The concept? ‘Simplexity’. Behind this portmanteau word is a very easy-to-use, ludic and engaging user interface, but giving access to targeted and relevant content. 

“We’ve conceived a flexible tool which adapts to the user: our content pieces can be consumed everywhere at any time, in 20 minutes on average, or even in 5 minutes thanks to microlearning”, Frédérick Bénichou, one of the co-founders, says. 

More specifically, how does it work? “We use the flipped pedagogy. The learner watches a 2 minute video or answers questions, and it is only just after that the learner will access to the pedagogical content. This content allows learners to either correct themselves, or go further, and the whole thing infuses a new dynamic to the learning process.

The success amongst employees can also be explained by the playful aspect of the platform: we score points at each levels, progressively. Numbers prove that offering gaming elements creates high engagement rates and a healthy competition between coworkers. “For a company, it is also a good way to find hidden talents within the company, people that will potentially turn very helpful for the company”, Frédérick Bénichou adds. At Pernod Ricard for example, the employee who had the best score on digital culture was a storekeeper in Cognac; his knowledge on the topic and the fact that his bosses realized this brought him to coach the Chief Marketing Officer.” While having fun, one develops his digital culture and his emotional intelligence with the possibility to challenge his peers or to be helped and coached by another learner within his organization. 

So what’s the link with Netflix? Training modules, short and playful videos are all accessible anytime from any support (smartphone, tablet, computer). And thanks to machine learning, played content pieces help to recommend others – the startup created 27 distinct learners’ profiles. 

After having tried at the beginning to target individuals, Coorpacademy revised its business model since then and only works in B2B for large accounts (Crédit agricole, Renault, Auchan, L’Oréal, Engie, Michelin…). Companies pay a subscription which allow their employees to access the training catalogue. Rates are decreasing depending on the number of users: from 9,90 euros a month for less than 100 employees to less than 7,90 euros from 300 employees, without any fixed-term appointment. It can be specific training content made for the company or the more general catalogue with soft skills oriented training – or a mix of both.  

Coorpacademy recently implemented an internal control training program for Pernod Ricard, or a platform to make ‘La vie en bleu’ – a program around healthy good, health and wellbeing – known to all 350 000 employees at the Auchan Retail group. For soft skills training that are proposed to all companies, Coorpacademy is relying on a network of more than 40 partners and experts, including Capital and Management magazines, but also Dunod, Bescherelle, Video Arts, IBM. The website offers more than 1,000 videos and 8,000 questions (digital culture, management and leadership, future of work…) and covers more than 90% of soft skills identified by the World Economic Forum. A 10 million euros fundraising in 2016 allowed Coorpacademy to go abroad, by translating the training content in English.”

Benjamin Janssens

Voir l'étude de cas