Problem presentation

Let's imagine that our client or boss comes to us and says that they want us to develop an interactive web application in Shiny for Adult data source. They expect from us a fully functional first version and leaves, in principle, everything in our hands (including design definitions).

Once we have the dataset (or any link to it), the most sensible thing to do will be to take a look at the documentation if there is one. In this case, we have https://archive.ics.uci.edu/ml/datasets/Adult and https://archive.ics.uci.edu/ml/machine-learning-databases/adult/adult.names. These web pages contain summarized context information, the different variables names, and their possible values.

Although it might sound trivial, client briefs, documentations, context information, and so on are very useful pieces of information for our applications, as they will give us insights on how the source of information that we have to work on was generated and what purpose did it pursue. In this sense...