Software Quality Attributes › ... › lecture-slides › 07_QualityAttributes.pdf · Software...
Transcript of Software Quality Attributes › ... › lecture-slides › 07_QualityAttributes.pdf · Software...
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Software Quality Attributes
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how the customer explained it
how the project leader understood it
how the analyst designed it
how the programmer wrote it
how the business consultant described it
documentation installation customer was billed for
post installation support
what the customer really needed
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Functional Requirements
First goal is to solve the functional requirements● meet & exceed the functional requirements
– “meet” is a must– “exceed” is better
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Technology
Match functional requirements to technology
OSS vs Commercial● what type of support is available● what type of customization is possible
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Performance
What does it mean?● hand held application performance● web application performance
– banking, eBay, Google● game performance● real-time applications
– robotics
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Quality
Stability & Bugs
● is there ever a bug free software system?● what defines a stable system?
– revision control systems
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Fault tolerance
In the case of failure....
Redundancy● at what level
– application vs component – batman has many suites but one bat-mobile?
Graceful exit● hmmm..... lets see then
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Fault tolerance
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Fault tolerance
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Fault tolerance
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Fault tolerance
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Fault tolerance
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Performance
Throughput● def:
– calculations per second– transactions per second– messages per second
● do you see a trend here?● campus Internet lunch time gremlins
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Performance
Throughput● peak throughput● average throughput● should a system be designed for peak or average
throughput
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Performance
Latency● latency is in the eye of the observer● inherently present in everything
– can not be eliminated– reduction & mitigation
● measuring latency is hard
Response time● combination of computational and communicational
latencies
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Availability
Has a direct impact on functional requirements● how?● easy to measure
– uptime● easy to specify
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Data Specific Qualities
Size
Interoperability
Changes to schema
Replication
Consistency
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NonRuntime Qualities
Evolution● code size● coupling / dependencies
Portability
Reusability
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NonRuntime Qualities
Interoperability● at what level?
– system / components– data– which one is better?
● interoperability via standardization– communication protocols– schema
● XML
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NonRuntime Qualities
Ease of use● user interface is the face of the software● logic is the back end
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Operational Qualities
Cost● what are some of the things that cost money
Supportability● user support● technical support
Configuration & Distribution
Release management● backwards compatibility