The 1.5 Sigma Shift

LCA system boundaries define which life cycle stages are included in the assessment. A "cradle-to-grave" analysis covers the entire product life, from raw material extraction through manufacturing, use, and final disposal. In contrast, a "cradle-to-gate" assessment is a partial LCA that ends when the product leaves the factory gate, excluding the use and disposal phases.

Design for Disassembly (DfD) is a design strategy focused on enabling the easy and cost-effective separation of a product's components and materials at its end-of-life. By prioritizing non-destructive separation, DfD facilitates repair, reuse, remanufacturing, and high-purity recycling. Key techniques include using mechanical fasteners over adhesives, modular construction, and clear material labeling to maximize value recovery.

The International Ergonomics Association divides the discipline into three primary domains of specialization: physical ergonomics focuses on human anatomical, anthropometric, physiological, and biomechanical characteristics as they relate to physical activity, cognitive ergonomics concerns mental processes like perception, memory, and reasoning, and finally organizational ergonomics deals with the optimization of sociotechnical systems, including organizational structures, policies, and processes.

A standardized categorization of artificial satellites based on their wet mass, including fuel. The primary classes are minisatellites (100–500 kg), microsatellites (10–100 kg), nanosatellites (1–10 kg), picosatellites (0.1–1 kg), and femtosatellites (<100 g). This classification provides a common language for engineers, manufacturers, and launch providers to define mission scale, technical requirements, and cost estimations.

Design for the Environment (DfE), also known as ecodesign, is a proactive approach to product and process development that minimizes environmental and human health impacts across the entire product life cycle. It integrates environmental considerations into the earliest design stages, alongside traditional factors like cost and performance, to prevent pollution and conserve resources from the outset.

Life-Cycle Assessment (LCA) is a systematic methodology for evaluating the environmental impacts associated with all stages of a product's life. This "cradle-to-grave" or "cradle-to-cradle" analysis considers raw material extraction, processing, manufacturing, distribution, use, repair, maintenance, and final disposal or recycling. It quantifies inputs like energy and raw materials and outputs like emissions to air, water, and soil.

Solid-state batteries replace the liquid or polymer gel electrolyte of conventional batteries with a solid, ion-conducting material, such as a ceramic or solid polymer. This design aims to improve safety by eliminating flammable liquid electrolytes and to increase energy density and lifespan by enabling the use of high-capacity anodes, particularly pure lithium metal.

Six Sigma is a quality management methodology aiming for near-perfection. A process operating at a "six sigma" level has a yield of 99.9997%, meaning it produces only 3.4 Defects Per Million Opportunities (DPMO). This standard corresponds to a process where the nearest specification limit is six standard deviations away from the process mean, accounting for a 1.5 sigma shift in the mean over time (refer to the specific details on the debated 1.5 sigma shift as an empirical observation).

Rapid prototyping is a group of techniques used to quickly fabricate a scale model of a physical part or assembly using three-dimensional computer-aided design (CAD) data. In iterative design, it allows for fast creation of tangible models for user testing and stakeholder feedback, enabling quick design refinements before committing to expensive tooling and manufacturing processes.

Electrostatic actuation is a primary method for inducing motion in MEMS. It utilizes the attractive force between two electrodes separated by a dielectric gap when a voltage is applied. The force is proportional to the square of the voltage and the capacitance gradient. Common designs include parallel-plate capacitors for out-of-plane motion and comb drives for large in-plane displacement.

The NIOSH lifting equation is a tool used by occupational health and safety professionals to assess the risk of musculoskeletal injury associated with manual lifting tasks. It calculates a Recommended Weight Limit (RWL) for a specific task, representing the maximum weight a healthy worker could lift without increased risk of low back injury, considering factors like task geometry and frequency.

A set of nine foundational principles for sustainable design, developed by William McDonough and Michael Braungart. They advocate for the rights of humanity and nature to coexist, recognize interdependence, respect relationships between spirit and matter, accept responsibility for design consequences, create safe objects of long-term value, eliminate waste, rely on natural energy flows, and understand the limitations of design.