Focused improvement in Theory of Constraints is the ensemble of activities aimed at elevating the performance of any system, especially a business system, with respect to its goal by eliminating its constraints one by one and by not working on non-constraints.
The method to achieve focused improvement is the use of the five Thinking Processes.
Most of the popular performance improvement methods, such as TQM or reengineering, are not focused improvement methods, i.e. they do not distinguish working on the factors that limit a system's performance (constraints) — which brings immediate results, from working on non-constraints — which does not bring any results, only increases costs and distracts management's attention.
See also: Donella Meadows' twelve leverage points to intervene in a systemFamous quotes containing the words focused and/or improvement:
“In the nineteenth century ... explanations of who and what women were focused primarily on reproductive events—marriage, children, the empty nest, menopause. You could explain what was happening in a woman’s life, it was believed, if you knew where she was in this reproductive cycle.”
—Grace Baruch (20th century)
“... till women are more rationally educated, the progress of human virtue and improvement in knowledge must receive continual checks.”
—Mary Wollstonecraft (1759–1797)