Excellent Account Management

Method and training for your account management


years of experience


books sold

€23 billion+

contract turnover protected

Start in 3 steps

Start in 3 steps

Speed dating


In a 30-minute online call we will get to know each other and you can investigate to what extent there is a match between your issue and our approach.



In this personal conversation, vision on the problem and solution are central. What do you want to achieve and how can you be sure that you achieve it?


(€ 2500)

When a more extensive analysis is required, we present a development roadmap after interviews and research into documents and working methods.

Why our solutions work

More than €23 billion in customer contracts worldwide are protected with our processes. For several customers, annual profits have increased by more than €100 million! Well, a question doesn't always have to be that size, but it is great Numbers, not? Why are our solutions so effective?

Results arise from your working method. Structural results come from a structural working method. Tenacity's processes are specific to service providers. They bring essential improvements in the working methods of your team and of you as management. These methods are based on insights and best practices from years of experience. We have been working with our customers to achieve the highest results for more than 35 years existing customers.

Tenacity's solutions enable account managers to do things that bring results and help them achieve this the most effective way to do. We guarantee a fast and smooth implementation.

A selection of our customers


Philips HealthCare


Canon Business Services




Start People employment agency


Olympia Employment Agency


Medtronic IHS


Open Line Cloud solutions


CSU Cleaning

What our customers say...

Johan StellingerwerfManaging Director Sodexo Altys
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You can lose customers while having high customer satisfaction. Clients for Life gives the word 'value' a whole new meaning. Now I look at the relationship from the perspective of what relevant added value you can provide from your organization instead of from your product or service. This means that I shape the relationship with my customers in a different way. Very inspiring.
André MeijerGeneral Manager Volkerwessel Telecom
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If you think it's all about customer satisfaction, you're in for a surprise. Tenacity shows how your key accounts view your organization and provides guidance on how you can lead your organization to higher customer retention.
René NijkampGeneral manager Sales & Industry Management Start People
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Clients for Life helps achieve our goal: 100% of our clients choose Start People every time based on the value they experience in the collaboration. Do you have the same ambition? Then I highly recommend this book. Then you can also read why we believe this goal starts with consciously choosing customers who are a good fit for us.
Michiel HillebrandChief Operating Officer Leviy
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Tenacity has helped us with a strategy to remain relevant to our customers over the long term. The Account Plan Canvas is a great instrument in this regard.