if we initially identified the constructs of particular topic through interview and review then developed a survey questionnaire based on the qualitative data, could such a scale be called as a model?
A model generally consists of the relationships among a set of variables. So, if your initial work produced a set of inter-connected hypotheses, then the answer would be yes.
Alternatively, a scale is a set of questionnaire items that all measure the same thing, which is not a model.
I totally agree with Prof Morgan. In light of his response, therefore, the qualitative work only helped you to design the questionnaire by identifying relevant contructs related to phenomenon under consideration but did not produce a model - hypothesised relationship between identified constructs.
Yes, your qualitative research played an exploratory role in your mixed methods design.
Yes, I share the same with David and Ferdinand that serving as an exploratory instrument for the quantitative survey does not grant the production of a model. A model needs to have specifications of the variables and the potential relationships between them.
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