Effects, efficacy, efficiency and effectiveness in physical therapy - how far are we?

The Journal of Physical Therapy (JPT) is stepping over its third volume of successful dissemination of research findings with information shared across the globe in the field of physical therapy. The aim of this editorial in this issue of Journal of Physical Therapy (JPT) is to explore into the understanding behind the use of four common terms-effects, efficacy, efficiency and effectiveness as four inter-related yet different terms in the field of Physical therapy (PT) with a historical perspective and implications for the future.