C++ Qt 47 - Intro to model view programming 

no. The feature of this "design technic": Model / View, is to separate the control of datas gestion and the control of views. Like that, you can work on and concentrate on only one part at a time (like two teams could do for a project... one on the view, the other one on the model... for exemple). Or... you can just define a model with some functions to do with your datas without look at your datas... a generic model you will use for some other projetc (for exemple), for be able to use the datas and like thme to a view quickly and easier. BUT if you look at this design conept for one little code only... sure... you can not understand the advantage of this design Model / View.

go to your project directory and double click your executable file I.e. .exe file. You will get a series warnings that lack of .dll files. Then you find these .dll from ur coworkers or internet and paste them into the folder.

beacuse the model is a class who implement some features around the update and other stuff... you can see model like an object who can do some actions between datas and view(s)... automatically. For little jobs, model are not necessary and you can do like you think. But for big works with many views and big datas... you will yourself finish by construct a class who do the job of a "model type design". Qt is not Model/View/controller... but only Model/View. you want to see MVC really in action... go to see Ruby on Rails (framework for web site build in Ruby OO langage).

So true. Especially with *big* ones!