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Efficiency may refer to:

Energy Efficiency , useful work per quantity of energy

--- Energy Conservation , reducing the use of energy

--- Electrical Efficiency , useful power output per electrical power consumed

--- Fuel Efficiency , converting energy in fuel to kinetic energy or work

--- Lighting Efficiency , visible light from a light source per unit of energy, in lumens per watt

--- Mechanical Efficiency , the effectiveness of a simple machine, mechanical advantage over ideal mechanical advantage

--- Thermodynamic Efficiency , useful work per change in heat

-- Thermal Efficiency , useful work per the higher heating value of the fuel

Efficiency (economics) , a general term, to capture the amount of waste or other undesirable features

--- Pareto Efficiency , making one individual better off, without making any other individual worse off

--- Kaldor-Hicks Efficiency , like a less stringent Pareto efficiency

--- The optimisation of a Social Welfare Function

Efficiency (statistics) , a measure of desirability of an estimator

Efficiency Ratio , expenses as a percentage of revenue, etc.

Efficiency Movement , of the Progressive Era 1890-1932, advocated efficiency in the economy, society and government

Material Efficiency , compares material requirements between construction projects or physical processes

Specific Impulse , in propulsion systems, a measure of fuel-efficiency

Textual Efficiency , density of a message

Volumetric Efficiency , in internal combustion engine design

Algorithmic Efficiency , the speed and space requirements of a computer program

A one room Apartment