Research & evidence
359.tennis collects evidence to improve its own method, not to make claims. In daily practice at the NTC, coaches record observations within a fixed lesson structure. Those observations help adjust lessons. We build evidence progressively: observe first, substantiate next, publish only after that.
We share what we learn openly once it is substantiated. Publications, datasets and benchmarks appear here — free to cite with attribution.
How mature is the evidence?
We explicitly distinguish operational observation, proof development and scientific research, so it is always clear what is established and what is not.
What is established
We have supported players since 2005 and today teach tennis at the NTC / TV De Kegel in Amstelveen. Every lesson is built on the same method and lesson structure, and coaches are trained and guided in it.
What we currently observe
Coaches record observations per block on learning goals, effort and progress. These are operational observations from practice — intended to adjust lessons, not to draw conclusions about groups.
What we are testing
Our working hypothesis is that a consistent lesson structure with Fit · Fun · Focus makes progress more visible and easier to discuss. That is a hypothesis under test, not a demonstrated effect.
What we are working towards
An open benchmark with a described methodology and a controlled dataset. Publication only follows once source, period, sample size and methodology are fully documented and reviewed.
Progress benchmark — first edition
Our first open benchmark on progress in youth tennis players. Methodology and dataset are being prepared; publication date follows once the dataset is complete.
View progressWe do not publish personal player data, child data or internal dashboards. For press, citations or partnerships, see the press kit. Background on the method is on the 359 Method.
Frequently asked questions about research & evidence
- How does 359 develop evidence?
- Step by step, from daily practice. Coaches record observations within a fixed lesson structure; we use those observations first to improve lessons. Only when dataset, source period, sample size and methodology are fully described and reviewed do we publish conclusions.
- Is the 359 Method scientifically proven?
- No. The 359 Method has been developed and validated in practice, but there is currently no independent scientific research demonstrating effects of the method. We make no claims about outcomes that go beyond the available evidence.
- What is the role of the NTC proof environment?
- The NTC / TV De Kegel in Amstelveen is where the method is applied, tested and adjusted every day. It is our own practice environment — not an independent research institute. What works there is fed back into coach education and guidance.