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*Qualitative interpretation* m5a

**The modularisation process**

Within the *Interpretation* module A05-m5, firstly a qualitative interpretation is given in A05-m5a. This module *Qualitative interpretation* consists of two components. A classical explanation of the experimental results is obtained and discussed in a sub-problem-solving process presented in A05-m5ai. In A05-m5aii a tentative quantum mechanical explanation is suggested for a particular angular range (namely, small angles). In the original article, this quantum mechanical interpretation was dealt with in an appendix. It consists of a calculated estimation of the quantum oscillation wavelength, which is then used in a rough argument for the explanation of an oscillatory feature of the experimental results.

The figure of the deflection function which is used for the basic explanation of the differential cross
section in module A05-m5ai is part of the mesoscopic module MESO-m3c-defl. We have copied the figure
to this module in order to make this module complete. In the original article, the figure referred to in the qualitative explanation is the *calculated* deflection function, which is determined in a later
stage of the problem-solving process. Strictly speaking, this makes the original line of discourse inconsistent. However, only the general features of the figure are used. The
qualitative explanation in A05m-5ai still contains a `forward reference': an assumption is made which is
known to be satisfied only when the resonance energy for this system has been determined in m5bi.
In a modular structure precisely targeted and explicitly characterised forward references can be taken
into account more smoothly than a statement ``(for the estimated value of *H*_{12} given later)''
[A05,p.67].

**The resulting module**

The use of isolating the qualitative from the quantitative interpretation, is that readers who wish to get the qualitative idea are not submerged in the elaborate quantitative calculations. On the other hand, this distinction causes some overlap, since some qualitative aspects are included in the module *Quantitative interpretation* as well in order to make that module self-contained.

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