How to decide the no.of models required for our application implemention

Hi ,
i ahve one basic quetion in WD development.
how to decide the no.of models (aRFC ,EJB..etc ) required or needed to get the functionality of our application ?
for Ex:
my application consisits of belwo functionalities.
1. serach for the country
2.display the bank lis for the above country
3.display the bank details of the selected bank in the step no.2
any one of you explain me how to decide the no.of models required for avoe functionalities .
or is it in a single model we can include the all the above functionalities ?
Regards,
Govindu

Hi
It all depends on application to application and requirements better to consult with functional guys or team lead what exectly they want to implement .All could be possible with RFC or EJB , some alternatives are
1. serach for the country : For this standard java API is there which populate all country (no need any rfc or ejb)
2.display the bank lis for the above country : (Check if there any webservices for this or create manually value help for this , even if u will use the RFC abaper guys will do the same )
3.display the bank details of the selected bank in the step no : step 2 will solve this also with one additional field i.e address and details.
I hope you agree with the point that stand alone WD app can do these all thing without any model.
Best Regards
Satish Kumar

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