Osman Pehlivanoğlu

Quality Function Deployment
We can define QFD as converting the consumers' demands into 'quality characteristics' and developing a design quality for the finished product by systematically deploying the relationships between the demands and the characteristics, starting with the quality of each functional component and extending the deployment to the quality of each part and process. The overall quality of the product will be formed through this network of relationships.
QFD, broadly speaking, is a general term that means 'deployment of quality through deployment of quality functions.' (QFD Integrating Customer Requirements into Product Design, Yoji Akao, p5)

Error-Proofing
It is a basic principle of manufacturing process design that any mistake whose prevention relies on operator vigilance is sure to occur sooner or later. If a job can be done wrong, it eventually will. This is the concept behind error proofing, or poka-yoke. Error-proofing devices and self-check systems support the lean manufacturing principle: "Don't take it (poor quality), don't make it, don't pass it on." Self-check systems can be treated as a special class of error proofing devices that, instead of actually preventing mistakes, catch them before they can cause significant harm. (Beyond the Theory of Constraints, William A. Levinson, p 122)

Degrees of Freedom
The degrees of freedom of a system depend on the number of variable (coordinates) needded to describe its motion.
For example, the motion of the mass on a spring that is assumed to vibrate only in a vertical line can be described with one coordinate, and thus possesses a single degree of freedom. A bar supported by the two springs needs two variables, and therefore possesses two degrees of freedom. (Engineering Mechanics Statistics and Dynamics, Eric William Nelson, Charles L. Best, William G. McLean, p 462)

Mechanization
In improving productivity, the important elements have been mechanization, automation, and control of a manufacturing equipment and systems. Mechanizationcontrols a machine or process with the use of various mechanical, hydraulic, pneumatic, or electirical devices. In spite of its benefits, in mechanized operations the worker is still involved in a particular process directly and must check each step of a machine's performance. (Manufacturing Engineering and Technology, Serope Kalpakjian, p1145)