What causes software failures - ️️• Lack of user input/involvement
• Incomplete requirements and specifications
• Changing requirements and specifications
• Lack of discipline in development processes
• Lack of methodical usage of metrics
• Lack of resources
What is a use case...
IN4MATX 43 QUIZ 2
What causes software failures - ✔️✔️• Lack of user input/involvement
• Incomplete requirements and specifications
• Changing requirements and specifications
• Lack of discipline in development processes
• Lack of methodical usage of metrics
• Lack of resources
What is a use case? - ✔️✔️• A textual description of a set of actions defining
interactions between an actor and the system to
achieve a goal
• A use case describes a set of flows that together accomplish a specific user "goal"
Software failure causes relate to requirement issues - ✔️✔️• Lack of user
input/involvement
• Incomplete requirements and specifications
• Changing requirements and specifications
Software failure causes relate to lack of rigor/formality - ✔️✔️• Lack of discipline in
development processes
• Lack of methodical usage of metrics
CA payroll system and DWP billing system failure causes are - ✔️✔️• The task is
incredibly complex:
• Software must conform to the reality of payroll contracts, laws, billing policies.
• Progress is hard to measure.
• Part of the goal is to update systems in place since the 1970s.
Shopa failure causes are - ✔️✔️• The company is still trying to figure out what product
to build
• No one knows inside the company what they are building
Definition of REQUIREMENT - ✔️✔️what the software should do (without saying how it
should do it)
Requirement analysis is - ✔️✔️Activity of discovering/observing/gathering
customer's needs
Requirement specification is - ✔️✔️• Activity of describing/documenting customer's
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