TOC (Theory of Constraints) is methodology for solving key problem in system which is called Constraints. Nowadays. it's application is going to be wide and it's concept is being implemented. This paper uses five focused steps of TOC for solving quality problem. especially, it analyses airline service quality through SERVQUAL and the constraints is showed in QFD (Quality Function Deployment) then the solution is suggested.

At present, company has to produce a product that consumer like with a competitive price, a good quality, and a fitting time to supply. Process control and quality control are very important to supply with a product uniformly and inexpensively. Process co