Mash-ups is an ideation technique that generates new design concepts by forcibly combining two or more existing products, services, or concepts that would not normally be associated. By asking 'What if we combined the experience of A with the model of B?' the method produces hybrids that inherit strengths from multiple domains and sometimes reveal entirely new value propositions. It is a structured form of analogous thinking that produces ideas with a clear conceptual lineage rather than ideas that feel arbitrary.