length to convince especially my principal academic reviewer that it was worth-while working on it. Once this fact however was proven convincingly my work on this subject was enthusiastically followed by the faculty. Yet it was not this fact that romantically induced my wish to work on the notions of  'Time' and 'Temporality'. The phenomenon of 'Time' fascinated me already since my boyhood and I was only eager for concluding my academic studies with an investigation of the fundamental ontological thoughts on this subject. Something I considered at the same time a nice completion of the 'main forming period' of my life.

My work than, that is written in Dutch (215 pages), is divided in three parts.

In the first, also as a historical thematic introduction to the notion of time, Heidegger's notion of time is compared (and contrasted) with the common philosophical and the mathematical or physical understanding of it. Especially Bergson's notions of  'temps' and 'durée' are given attention, also to value Heidegger's criticism on them. The neo-Kantian ideas of time are investigated too, and the same with the notions of time as used in the works of Husserl and Brentano. By this the originality of Heidegger's concepts is validated.

The second part consists out of a textual introduction explaining the key-notions by which the translated third chapter from the second part of Sein und Zeit can be grasped properly. In an appendix after the third part also all the main notions of Sein und Zeit are elucidated.

In the third part the two main concepts are commented that form Heidegger's notions of time and temporality . Also becomes clear that the so often mentioned influences of Kierkegaard on Heidegger's ideas do not reach further than they possible could have had in Jasper's philosophy, which in that perspective ought to be given the priority than.

As a second appendix is an article presented with the conclusions of a study of the total work of Emil Lask with regard to possible influences by his work. This study has proven that suggestions of what influence so ever, and more over on the forming of Heidegger's notions of time and temporality, are completely false.

This work of mine is a contribution by which in the history of thought  Heidegger's fundamental ontological notions of time and temporality have been given the proper place they did not had before. The traditionally too easily accepted nonsense about the immediate forming influences either by philosophers who developed ideas about time before, or by Heidegger's philosophical contexts as well at the time as at the days of his education, repeated again and again in the secondary literature has been exposed as such. More over, the thorough investigations, closely related to the original text, have shed new light now on as well the understanding of the architecture of Sein und Zeit as on the genesis of its main constituent ideas and their expression.