The IDEO cards are a tool for designers to brainstorm and create connections between concepts and methods. “IDEO’s human factors specialists conceived the deck as a design research tool for its staff and clients, to be used by researchers, designers, and engineers to evaluate and select the empathic research methods that best inform specific design initiatives. The tool can be used in various ways—sorted, browsed, searched, spread out, pinned up—as both information and inspiration to human-centered design teams and individuals at various stages to support planning and execution of design programs.”

See the webpage for the cards:
Apparently, the deck of cards itself can be bought only in San Francisco, but there’s also the app for iOS: