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60 Examples of Quality Requirements

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Quality requirements are specifications of the quality of products, services, processes or environments. Quality is any element, tangible or intangible, that gives things value beyond their functionality and features. The following are illustrative examples of quality requirements.
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.

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
Next read: Non-functional Requirements

Quality Requirements

This is the complete list of articles we have written about quality requirements.
Accuracy
Aesthetics
Appellation
Availability
Build Quality
Customer Service
Defect Rate
Design Quality
Durability
Ease Of Use
Efficiency
Experience Quality
Look And Feel
Material Strength
Precision
Privacy
Quality
Quality Management
Reliability
Requirements
Response Time
Safety
Scalability
Specifications
Texture
Universal Design
Uptime
Usability
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