In the 70s a systemic model of the world was established. It represents the way it works including all information that make it up such as demographic data, economic data, etc. According to this model confirmed by the actual data, after an exponential growth and a steep decline in resources over the past 40 years, our world will experience a collapse at all levels during the next two decades. All signs indicate that this collapse is inevitable, however we can prepare and mitigate their consequences. Maintenance is present in all sectors and is one of the means for limiting the consequences of this collapse. If we want to leave future generations a world where life is good it is our responsibility to change our habits and return to practices in which common sense plays an important role.