The most significant expense in hardware development is the labor cost, not the physical materials, which can be sacrificed in testing. This insight, attributed to Elon Musk, justifies a "build, break, and iterate" approach to quickly get on the learning curve and reduce the cost of engineering hours.

Early hardware prototypes don't need to be functional to be valuable. To test fundamental, real-world constraints—like whether a battery unit can fit through a standard yard gate—use the cheapest, fastest physical models possible, such as literal cardboard cutouts, to get immediate feedback.

For early R&D, don't waste time designing custom components in CAD. Instead, buy existing products, tear them apart, and reuse their mechanisms. A simple tape measure can serve as a constant force spring, saving hours or days of design work and getting to a proof-of-concept faster.

Instead of starting with a blank slate, Nike's team prototypes new ideas by physically cutting and modifying existing products. This "cobbling" method enables rapid, low-cost testing of core concepts before investing in new designs and expensive molds, allowing them to fail fast and forward.

Clinical trials often just report success rates and discard failed devices. This is a missed opportunity. By contractually requiring failed devices to be returned, R&D teams can analyze failure modes and create representative lab tests, drastically speeding up development and avoiding expensive repeat clinicals.

Product development's most valuable activity is iteration. The goal isn't to avoid failure, but to achieve it quickly and cheaply to maximize learning. A good failure uses the simplest possible prototype (e.g., duct tape and a 2x4) to answer a key question and inform the next step.

A high production rate is a core R&D tool for SpaceX, not just a manufacturing goal. By creating a "hardware rich" environment with abundant, cheaper prototypes, it enables an aggressive build-test-learn cycle. Failure becomes a low-cost data-gathering exercise, not a catastrophic setback.

Anduril's R&D building houses machine shops, labs, and a 'dev test area' designed specifically to break products. By putting engineers across the parking lot from facilities that can rapidly prototype and test for failures (e.g., saltwater corrosion, vibration), they create an extremely tight feedback loop, speeding up iteration.

Building custom components for early-stage prototypes is slow and expensive. A faster, more cost-effective approach is to buy existing commercial products that contain similar components, then scavenge those parts for your prototype. This enables rapid concept validation without investing in custom design and manufacturing.