These terms are all part of legal theory and can mean slightly different things for different branches of the law. For example in a criminal law context - "wilstheorie" would be the theory of volition.

This is however a contractual context and so what your text is saying is that three factors will be looked at to determine in the case of a dispute whether a juristic act and therefor a contract has come into being (from what I understand) from the text.

In a contractual context - "wilstheorie" would probably therefore relate to the freedom of contract concept - i.e. the extent to which the law assumes that people have economic freedom to enter into a contract.

Secondly the question of declaration of intent would be looked at and this is what is probably meant the "verklaringstheorie" - here those considering a dispute would look how the parties have expressed their intent in the wording of the contract and possibly the surrounding circumstances (depending on the legal system in question)

Finally the theory of (legitimate) expectation will be looked at, i.e. the expectation that one contracting party has to expect the other will perform and fulfils his/her promises.

I can thus tell you what these concepts probably mean in contract law but to find a singular term in English for each is not going to be easy.

I suggest you say something along the lines of :

The dispute will therefore be governed by the general considerations (or debate) pertaining to the establishment of a juristic act, namely the freedom to contract, the contractual declaration of intent and the contractual expectation that obligations by the other contracting party will be fulfilled.

Is a bit long winded but would be more precise than coining phrases that don't really exist as one-worders in contract law otherwise (as far as I am aware)

Hope it helps

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Note added at 1 hr 28 mins (2005-03-14 09:02:27 GMT)
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Finally:

Managed to just find my old study guide of years ago from UNISA (University of South Africa)

The South African system is a Roman-Dutch system and in the chapter on legal theory it refers in fact to the three theories by name:

\"Three identifiable theories were used in this enquiry, namely the INTENTION THEORY, the DECLARATION THEORY and the RELIANCE THEORY

That\'s it!

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Note added at 1 hr 32 mins (2005-03-14 09:06:22 GMT)
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Legal science was initially characterised by the search for a single common element as the basis of contract. Three identifiable theories were used in this enquiry, namely the intention theory, the declaration theory and the reliance theory. However, no single theory could provide a satisfactory solution and therefore it is chiefly combinations of the intention theory and reliance theory that are propagated today.

The law of the Netherlands has been chosen for comparison since it contains several points of contact with South African law as well as a refinement and extension of the various approaches to the problem.



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Note added at 1 hr 55 mins (2005-03-14 09:29:54 GMT)
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There are three choices for the first one accepted in contract legal theory:
consensual -, will -, or intention theory

The second one is fixed as the declaration theory

The third one is the reliance theory. The materials on trust theory are not related.

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Note added at 2 hrs 2 mins (2005-03-14 09:37:02 GMT)
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Just for completeness and to make sure my source is not only a SA one - from a UK textbook (Textbook on Contract Law - Jill Poole, 7th edition) the reliance theory is the most significant post-classical theory of contract and the main exponent has been Professor Atiyah. Some googling with this detail that will serve to confirm.


Both Fuller and Atiyah’s theory of contracts eliminate expectation interest by ...
www.truthawakens.com/contracts.asp - 13k - Cached - Similar pages

Deconstructive Pracitice and Legal Theory-- Part III
... In essence, Atiyah\'s benefit/reliance theory of promissory obligation must
admit its own \"dangerous supplement\" to explain mutually unrelied upon ...
www.yale.edu/lawweb/jbalkin/articles/decprac3.htm - 71k - Cached - Similar pages

[PDF] DPLT 1 1
File Format: PDF/Adobe Acrobat - View as HTML
... On the other hand, under Atiyah\'s. benefit/reliance theory, the acceptance of
benefits or the creation of reliance. becomes the paradigmatic case of ...
www.yale.edu/lawweb/jbalkin/ articles/deconstructivepractice.pdf -