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In my field (pharma industry) efficacy is about a medicine that works in ideal controlled conditions (e.g. a clinical study) while effectiveness means that the medicine works in real world conditions, which are usual not controlled and far from ideal.
Report Ana's answer
Both are forms of measurement.
EFFICIENCY - The measurement of TIME AND RESOURCES consumed for a given process to achieve an end product or service.
EFFECTIVENESS - The measurement of end product QUALITY AND PERFORMANCE against a requirements specification for a product or service.
Report Kenneth's answer
Efficient is a word that s root expresses a meaning but also, a type of slang. When the word is used it often has a double meaning. At least in some industries. Efficiency on the other hand is a more direct expression of value with ends facts to determine efficiency.
Report Liz's answer
Efficiency is doing what is required of you, making sure positive feedback is received before you rest which effectiveness has to do with using the available resources to create opportunities. In conclusion, the two are synonymous.
Report Michael's answer
In human resources and management, they are common words used together in the noting effective utilization of resources in achieving goals and objectives of an organization. Efficiency: causing effects on,producing results, actively operative. Effectively:decisive solutions,getting remedies,deal decisively,finding lasting solutions.
Report Chris's answer
Kenneth hi. Only with efficiency you get the objective through optimized resources.