5. Multiple use

<p><strong>THE PRINCIPLE OF MULTIPLE USE </strong></p>

<p>Viable systems show a preference for products and processes by which they can kill two (or even more) birds with one stone, a variation of the Jiu-Jitsu theme. What we create or do should <strong>serve more than one purpose</strong> at a time. Multiple use also means solving problems with <strong>several partial solutions</strong> and not with one 100 % solution (which implies that a failure also means a 100 % failure). In housing energy systems, for example, a mix of energy boxes, ambient heat from the ground, biogas from waste, water purification, composting, and a biotop roof - each of them even serving several purposes - can be combined to one complex system. In case one solution fails, the rest still works: the system shows <span style="text-decoration: underline;">multistability</span>.</p>

<p><strong>Precondition:</strong> <span style="color: #ff0000;">diversity of system components, small scaled system structure.</span></p>