Summary: In engineering, the transition from idea to product requires that the engineer produce clear proposals demonstrating the idea's practicality and economic feasibility. Smelser describes how writing is a key element in this process. Engineers don't need to know how to write.
Cradle to gate Cradle to gate is a boundary condition associated with embodied carbon, carbon footprint and LCA studies. A study to these boundaries considers all activities starting with the extraction of materials from the earth (the cradle), their transportation, refining, processing and fabrication activities until the material or product is ready to leave the factory gate.
WiFi RFID is pretty inaccurate say 10m. If you have a doorway you put exciters on both sides of the door. As a RFID object moves through the door the excites tells the RFID tag to announce itself so we know actually where it is. You have two so you can determine direction. This environment is called a Choke Point.