sachitha 0 Newbie Poster

I have previously done IT projects in structured approach, but not in Object oriented approach. At present i'm doing a project using an object oriented approach for a design of a 'disaster alert system'. I have identified classes such as 'disaster','warnings/alerts', 'location', etc. but i do not have any idea of boundary nor control classes.
i know the simple theories behind them, but i have simply no clue how to find out what 'boundary & control' classes are when it comes to practical application..
Are boundary classes simply 'Interface classes' like form classes etc? then for the attributes do you put all the fields in your interface??
Please help me out with some practical examples..

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