Therefore, to customize a house means to design and build a place to live according to the specific needs or demands of those who will occupy it, or to alter an existing place to meet such needs or demands. To design and build customized dwellings in collective housing, it is necessary to apply the term “mass customization”, which is the opposite of “mass production”. To mass-produce a house means to build the same model many times in order for it to be useful to many people. However, to “mass customize” a house it is necessary to manufacture many components that can be combined in various ways. The combination of these components could be calculated and visualized with a computer program, and the results could be spread through interconnected computer networks. Thus each individual or the members of a family, with the help of an architect, can choose the house in which they want to live, according to their requirements and within a collective environment. On the other hand, a “mass-produced” dwelling, which is part of collective housing, could also be adaptable or flexible so that it can be altered and therefore “customized”. The spaces of this dwelling may be indeterminate, without a prescribed hierarchy; they can have many uses or might change physically, long term or short term, with walls that can be located in different places, with special furniture or with moving partitions.