Effectivenss - for something to be effective, it does what it is supposed to do very well - This guard dog is very effective: the dog is supposed to keep people away / protect someone/something, it does this well - (In cutting an apple) This knife is very effective - the knife is supposed to cut the apple, it does this well Efficiency - to do something without wasting time and have the task still done well - That is a very efficient copy machine - the copy machine prints papers well and is not slow - He is the new efficiency manager - efficiency manager: a person who is hired to make sure work gets done well by other people and no time is wasted Hope that helps!

Efficiency refers to doing things in a right manner. Scientifically, it is defined as the output to input ratio and focuses on getting the maximum output with minimum resources. Effectiveness refers to doing the right things. It constantly measures if the actual output meets the desired output means work done effectively within less time.

I think effectiveness is related to how much something can give output in given circumstances , the conditions and output are important in effectiveness . Ex.- one particular batsman can be effective in overseas conditions over others . And efficiency is related to producing output for a given input. If one machine or system produce more output for a given input , it's more efficient. Output and input ratio is called efficiency in this Ex.- now a days LED bulbs are more efficient than old glass bulbs