As the full time coordinator of a repair shop with 40 enthusiastic volunteer repairers, I've learned a lot about product design and repair over the last 4 years. I'll take you on a tour of some of your favourite household items, how and why they break and what we can do to fix them. Along the way I'll share my insights into the troubleshooting process, how to apply the medical notion of differential diagnosis to electrical faults and how we decide when to give up on a repair. I won't hold back from naming and shaming the manufacturers who seem to be deliberately making things harder for us, with obstacles like oval shaped and security triangle screw heads. I'll give some tips and tricks for how you can assess the repairability of something before you buy it - ideally without taking it apart!