Accuracy | Appearance |
Batch traceability | Build quality |
Calibration | Cleanliness |
Cold resistance | Color accuracy |
Colorfastness | Compatibility |
Completeness | Consistency |
Defect rate | Design quality |
Dimensional accuracy | Durability |
Ease of use | Efficiency |
Electrical safety | Emissions |
Ethical sourcing | Experience quality |
Features | Finish quality |
Format & presentation | Functions |
Heat resistance | Impact resistance |
Interoperability | Load capacity |
Look and feel | Maintainability |
Material strength | Materials quality |
Noise level | Packaging quality |
Performance | Precision |
Pressure resistance | Privacy |
Reliability | Response time |
Safety | Scalability |
Security | Service excellence |
Shelf life | Size and dimensions |
Smell | Standards compliance |
Structural integrity | Taste |
Texture | Timeliness |
Toxicity | Uptime |
Usability | Water resistance |
Weight | Workmanship |
Types
Quality requirements have several basic types as follows.Design Quality
Design quality is the value of a design such as a product design to users. For example, a volume dial on a speaker that moves with a pleasing level of resistance without being too stiff or loose feeling.Build Quality
Build quality is the overall workmanship and materials quality of an item. For example, a speaker with a fine satin finish that is free of defects, color issues or smells.Experience Quality
Experience quality are requirements that make a product or service more pleasing to customers. For example, the requirement that coffee smell good when you first open the can.Conformance Quality
Requirements to conform to a practice, standard or regulation such as the requirement that a user interface conform to brand guidelines.Reliability
Enduring and consistent performance in real world conditions. For example, a drum designed to maintain its sound for at least 150,000 strikes.Consistency
The requirement that units be the same or that units be internally consistent. For example, apples that are mostly the same size with similar appearance and taste.Availability
The availability of a service. For example, a requirement for a software service to be up 99.99% of the time.Usability
Requirements related to ease of use such as a can of coffee that is easy for everyone to open and reseal.Look & Feel
The look and feel of products and services such as the aesthetics of a mobile device.Environments
The quality of environments such as the interior design of a hotel lobby.Service Quality
Customer service requirements such as the practice of greeting guests of a hotel by all staff in common areas such as hallways.Performance
Performance requirements such as the responsiveness and speed of a user interface.Maintainability
Requirements that things be easy to maintain and fix. For example, a mobile device with elements that can be swapped in and out by users to upgrade or replace things.Materials & Ingredients
Specifications of material and ingredient quality such as the requirement that coffee be organic coffee of a particular appellation.Social & Environmental
Requirements related to socially and environmentally responsible practices such as sourcing wood from well managed forests.Specific Examples
A few examples of how quality requirements are typically phrased. Quality requirements must be relevant to the value of a product or service and must be testable such that a test can be devised to confirm the requirement.All screens will be visually consistent with each other.
All screens will conform to the brand guidelines.
The lid will fit tightly to the frame with no visible gap between the two upon inspection.
The surface finish will be free of scratches or visible marks.
The check-in process will take less than 1 minute.
The system will be designed and operated for 99.9% uptime.
Suppliers of wood for the lobby will conform to the ___ forestry certification.
All screens will conform to the brand guidelines.
The lid will fit tightly to the frame with no visible gap between the two upon inspection.
The surface finish will be free of scratches or visible marks.
The check-in process will take less than 1 minute.
The system will be designed and operated for 99.9% uptime.
Suppliers of wood for the lobby will conform to the ___ forestry certification.
Summary
Quality requirements shape everything about how functional requirements are implemented. This includes any element of design, build and service practices that influence the customer experience.Overview: Quality Requirements | ||
Type | ||
Definition | Specifications of the quality of products, services, processes or environments. | |
Related Concepts |