Do you want to improve your teamwork?

We can tell you how.

learn with our In-person or virtual training programs



We take time to understand your situation and with a step by step approach we address these aspects that will bring you to great teamwork. We work with the best experts and guarantee a culture-fit delivery of the program. We make use of collective intelligence and neuroscience-backed methods.
Creating high-performing, well-connected teams is our expertise!

Find out what Yellow can do for you today.
Great teamwork is closer than you think!
"My team has grown bigger, stronger and more reliable. I have not lost any single member instead got many more, inspired to share what we developed with Yellow in our team-building session in Barcelona.
This was several years back and is still delivering success."
Ovidio Cardona, VP Global Cybersecurity Operations at SAP, Mannheim, Germany


Training and coaching
We can help you with the following custom-fit services. Please, select the program that interests you to continue reading.
Get your team on track

Get your team on track

A program to boost your team's effectiveness
Training for international teams

Create an inclusive work culture

Diversity & inclusion workshops
Coaching for leaders

Inspire your team

Training and coaching for agile leaders
Teambuilding in Barcelona

Shine a light on you

Workshops for team players

You are one step closer to connective teamwork!

"Yellow exemplified professionalism, thoughtfulness, and positivity in all their interactions with our team.
I would highly recommend them: an agile, engaging, option to provide thorough attention to your Learning and Development training plans."
Heather Harrison, Talent Growth Director, Vivaldi Group, New York City, USA.
Marianne Slotboom, founder of Yellow


Hi, my name is Marianne Slotboom, I am the founder of Yellow. Welcome to our website!

We are driven professionals - experts in our fields - on a mission to support inspirational leadership and a culture of great teamwork within tech organizations. Each of us has over 20 years of international experience in consultancy, training or coaching and we are deeply connected to prominent global business schools.

Our programs are innovative and will inspire you as they are interactive and based on the latest insights of neuroscience. You will learn while practicing with your own situations.

We work for international tech companies that span continents and cultures. Barcelona is our home.

We help you to improve your impact and get better results!



See more Clients


With Yellow our team improved their leadership skills through advice and different dynamics, both theoretical and practical. This support will undoubtedly allow our team to continue growing as professionals and as leaders.
Sergi Bech
Sergi Bech
CTO Atrápalo, Barcelona
Yellow has been a fantastic support throughout the planning and execution of the leadership training for our team. Marianne's approach in helping me design the practical training to our needs worked fantastic for us. Our leaders are very enthusiastic with the learning outcomes.
Sylvana Sansone
Sylvana Sansone
HR Business Partner EMEA of Headway Digital, Barcelona
Yellow provided an integral program for us, in which we addressed important leadership skills. The approach was well focused on our specific needs, which has contributed enormously to the value of the program. It was easy to apply new insights in daily work.
Kitty van Dijk
Kitty van Dijk
HR Manager of KPN Magnum, Madrid
With group dynamics and practical concepts Yellow helped us to reach our objective: to improve our relationship and increase trust within our team. We enjoyed a team training with the right atmosphere to get the best out of every team member. It has led to long-term constructive collaboration.
Daniel Puga
Daniel Puga
HR Manager Iberian Region at Nobel Biocare, Barcelona
The teambuilding training was engaging, thought provoking, and fun. It was a great experience and some even stated it was the best team building exercise they have attended. The training strengthened the bonds with our colleagues and showed us areas where we could improve as well. 
Andrea Werle
Andrea Werle
Global Director Cybersecurity Incident Management SAP, Palo Alto, USA
Yellow provided a great teambuilding program and we are still experiencing the benefits. The team improved significantly in their interpersonal communication, the way they handle the workload and how they address responsabilities. We have learned a lot and developed significantly as a team. 
Petra van den Dries
Petra van den Dries
Teamleader at UWV, Eindhoven
The trainer was very well organized, active, participatory. She introduced practical content, which succesfully brought out our issues working in multicultural settings. I’ve learned a lot from a great professional!
Augusto Sappia
Augusto Sappia
Participant Intercultural Session, Barcelona
I recommend Marianne to anyone who wants to have a clear view on personal changes they can make to function in a competitive, stressful environment. Her 'down to eart' analyses will enable you to change perspective; on yourself and on the situation at hand. You will be amazed how quickly you see the results.
Naomi Williams
Naomi Williams
Trade Officer at Dutch Ministery of Foreign Affairs, Barcelona
One of the best trainers I’ve ever met. Especially in the field of problem solving Marianne is capable of bringing a group of trainees to a much higher level. She is a type of trainer who makes time relative. A very nice person with a lot of ambition and humor.
Peter Heerschap
Managing Director of TEM, Rotterdam, The Netherlands
Marianne knows how to connect to her audience. She uses clear examples and shares her wide experience in a way that keeps the audience mesmerised. She is one solid example of teaching with the right doses of theory, practice and fine sense of humor.
Ferran Ferrandis
Ferran Ferrandis
Head of DCI (Data Center Infrastructure) at T-Systems Iberia, Barcelona
I have experienced the problem solving method that was taught to our team as very useful. The way the trainer enabled us to solve our problems was very special for us. We immediately felt her commitment and her very pleasant way of training.
Jo Koch
Jo Koch
SHE Advisor at Stork a Fluor Company, Maastricht Area, The Netherlands

My team has grown bigger, stronger and more reliable. I have not lost any single member instead got many more, and they help me to inspire the others to share what we learned with Marianne. I definitely recommend her personally, and surely will ask for her help again in the near future. I got to know Marianne when I was leading a global virtual team of IT Security Specialists. We were having a technical workshop in Barcelona and two intensive sessions with Marianne, with the aims:  1. Ensure that the team knows, understands and overcomes communication challenges; 2. Using the differences to enable the team for success breaching silos; 3. Help team members to become brothers in arms (engage, act, support and deliver as one team, one voice). This was several years back and they are still delivering success.


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