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Quality refers to the sum of all characteristics and features of an object, service, or process that relate to its suitability to meet specified or implicit requirements. Another understanding of quality directly relates to the end product itself.

Quality assurance refers to the totality of planned and systematic measures taken to ensure that products or services meet the required quality standards.

Quality control refers to the process of monitoring and inspecting projects, products, or services to ensure they comply with defined quality standards. It includes inspection, examination, and testing to detect and correct errors early.

Quality costs are the financial expenses specifically necessary to achieve quality goals. They include costs for planning, control, quality assurance, as well as for possible rework and replacement services.

Quality function deployment, abbreviated as QFD, is a standardised method in quality management used to define and represent the quality functions of a product or service.

Quality goals define the characteristics or features of the project result, the service to be provided, or the project target state.

Quality management involves comprehensive measures and regulations necessary to ensure and demonstrate the quality of products and processes. It is also an integral part of professional project management.

A quality management system is a structured approach implemented in a company or project to ensure compliance with quality standards. It includes guidelines, processes, procedures, and responsibilities aimed at achieving, maintaining, or improving quality goals.

Quantity structure lists all materials and components needed for a project. It helps to estimate time and cost more accurately.