What is the difference between effective and efficiency?

Effectiveness is the achievement of objectives. Efficiency is the achievement of the ends with the least amount of resources.
  • EFFICIENCY means: saving TIME, MONEY or EFFORT
  • EFFECTIVENESS means how well the job gets done i.e. the quality of the output.

Effective (adjective) describes something that obtains the result that was intended. Example use: An organized workspace for doing homework is an effective workspace.

Efficiency (noun) is the competency in performance; the ability to accomplish with a minimum of time and effort or cost. Example: Efficiency is important in this job because each task takes a number of steps to complete.