A further study of the Quadrinity Process, and probably the most significant long-term study to date was written in 1997 as the dissertation of the German psychologist Christiane Windhausen, at the Wilhelms-University Muenster in Westphalia. Mrs. Windhausen studied theology before graduating in psychology at the above university.

Her dissertation is based on studies carried out with 65 randomly selected clients, all of whom completed the Quadrinity Process in its present form during 1994 and 1995.

It includes relevant research data from the Frankfurt Self-Concept Scale and the Giessen-Test as well as using diagnostic tools from the Symptom Checklist SCL90R. This is an Insecurity-Questionnaire used in assertiveness-training as a form of self assessment which falls into three main categories:

1. The relationship with parents
2. The relationship with the inner-self
3. The relationship with siblings.

The ratings on the Frankfurt Self-Concept Scale showed that the Quadrinity graduates, in all cases, had not only made a rapid improvement, but had also remained stable throughout subsequent tests and studies. The study produced highly significant data regarding the corresponding improvements on handling general problems-management scale (FSAP), confidence in behaviour when facing decision-making (FSVE), and in general self-worth ratings (FSSW)

The data also proved that the Quadrinity Process produced significantly greater changes in its graduates than a controlled group undergoing a comparable three month group therapy at the Fliednerkrankenhaus Hospital. (The hospital used the same data and diagnostic tools to record their own clients progress.) The System-Checklist proved that between the first and second assignments compulsive behaviour and depression were reduced, and a steady improvement continued thereafter. However, the most important result in the Insecurity Questionnaire showed that for those on the Quadrinity Process, it produced an immediate and significant reduction in anxiety that continues past the end of therapy.

Summing up Mrs. Windhausen explains:
It is evident that the depth of therapy achieved during the 8 intensive days of the Quadrinity Process, is at least equal to three months of group therapy at Fliednerkrankenhaus Hospital. On all 38 scales, assessments recorded from the Quadrinity graduates were higher than those of the therapy controlled group, and in 11 out of the 38 group, there are significant differences in the ratings in favour of the Quadrinity Process. Among other things these ratings relate to self-worth, self-confidence, sensitivity and mood, spirituality and intimate relationships and other kinds of friendships.

Most importantly, it should be noted that in particular, relationships with parents were immensely improved. It is also evident that the changes in attitude produced by the Quadrinity Process provides an inner stability and ongoing improvement after the process.

Mrs. Windhausen stresses that the results of her research are particularly impressive in the ratings for compulsive behaviour and anxiety. Here the Quadrinity Process also appears to bring about effective long term improvements. She also shows that through the Quadrinity Process, participants experience a rapid increase of their 'social-resonance' - that is to say, they are more open towards other people after the Process; they are more able to express their needs, as well as having more intense experiences.

In addition, it has been shown that partners in heterosexual relationships have become more relaxed, with a greater capacity for devotion and commitment. These changes remain constant throughout the six months following the Process.

With regard to the relationship with the self, results from six out of seven scales also show stable improvements throughout this six month period. Improvements in self-worth and self-acceptance, day to day health and the flexibility of the participants were estimated by themselves as being greater directly after the Process than at the third assessment, nevertheless, the ratings remain well above those initially taken before the Process. Ratings for the ability to be in touch with emotions as well as the ability to express emotions remained generally steadfast which clearly shows that the Quadrinity Process enables a steady development of emotional competence to flourish.

And finally, the psychologist Christiane Windhausen affirms that: All the questionnaires and other test-procedures have shown that

Almost all the scales show significant changes in ratings which the participants are able to maintain and consolidate after the Quadrinity Process has finished. This means that participants experience a significant reduction of negative symptoms in all the different categories studied.

The most noticeable improvements are evident in the categories of self-confidence, a sense of self-worth and self-acceptance. The Quadrinity Process therefore, has proved itself to be a highly effective programme to improve the ability to form relationships, as well as to develop greater emotional competence. This is reflected in self-reflection, an openness to experience, problem-and conflict-management, productivity, adaptability and taking responsibility, etc.