quality problems related to agile methods / scalability
DESCRIPTION
In this presentation we will see some problems with agile practices of quality assurance. Then we will focus on the particular problem of non-functional requirements. Finally we will refer to the quality problems that arise when using agile methods in large projects. Is assumed that these practices improve the quality of a software product. We will see that in any case there are problems in implementation, especially when scaling agile projects and take them to big projects distributed environments.TRANSCRIPT
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Agile practices can improve quality if they are implemented correctly
(Sfetsos, P., & Stamelos, I. (2010). Empirical Studies on Quality in Agile Practices: A Systematic Literature Review.)
Agile values
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Lack of evidence to prove its effectiveness and successful implementation
(Timperi, O. (2004). An Overview of Quality Assurance Practices in Agile Methodologies.)
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What quality characteristics are improved with each practice?
TDD
Pair Programming
Collective Ownership
Simple Design
User Stories
Refactoring
Inspections
Coding Standard
?
ISO 9126
(Mnkandla, E., & Dwolatzky, B. (2006). Defining Agile Software Quality Assurance.)
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Focus on building the right product for the customer (instead of only build it properly)
(Timperi, O. (2004). An Overview of Quality Assurance Practices in Agile Methodologies.)
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Testing is left mandatory but vague because its level and coverage are not instructed.
(Timperi, O. (2004). An Overview of Quality Assurance Practices in Agile Methodologies.)
Por último…
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New role of QAIs help in business
definition, risk measurement,
know user needs and underlying architecture.
nFR ill-definedNext…
(Mnkandla, E., & Dwolatzky, B. (2006). Defining Agile Software Quality Assurance.)
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As a Universidad ORT Uruguay student I want to come from my house to this Pechakucha.
Non-Functional Requirements (nFR) example
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As a Universidad ORT Uruguay student I want to come quickly from my house to this Pechakucha.
Non-Functional Requirements (nFR) example
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As a Universidad ORT Uruguay student I want to come quickly and economically from my house to this Pechakucha.
Non-Functional Requirements (nFR) example
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As a Universidad ORT Uruguay student I want to come quickly, economically and safely from my house to this Pechakucha. My own car
Non-Functional Requirements (nFR) example
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Stakeholders concentrate on software functionality (FR). Critical nFR are likely to be ill-defined and neglected.
(Um, T., Kim, N., Lee, D., & In, H. P. (2011). A Quality Attributes Evaluation Method for an Agile Approach.)
The problem is…
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Developers accustomed to cascade assume that nFR are solved by architects and designers.
(Rachel Davies, Agile Experience Ltd, UK, Non-Functional Requirements: Do User Stories Really Help?)
Plus…
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New approach is needed to improve non-functional aspects through quality attributes.
(Um, T., Kim, N., Lee, D., & In, H. P. (2011). A Quality Attributes Evaluation Method for an Agile Approach.)
Then…
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Useful to manage FR and nFR at the same time (but some nFR traverse the entire project)
(Um, T., Kim, N., Lee, D., & In, H. P. (2011). A Quality Attributes Evaluation Method for an Agile Approach.)
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Test that …- A blog post should be posted in less than 3 clicks.
- A blog post should be posted in less than 5 seconds.
As a blogger, I want to post an entry quickly and
efficiently to easily update the blog
The problem is that:
- The stories are designed to be completed
- Tunnel vision: when the team focuses on a story is easy to forget the RnF.
Example:
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As a blogger, I want to post an entry quickly and
efficiently to easily update the blog
How to deal with those nFR
spanning all the stories?
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Involving the customer is essential,
explaining the importance of
quality attributes.
(Leffingwell D. (2009). Scaling Software Agility. Agile Requirements Information Model. Online.)
As a blogger, I want to post an entry quickly and
efficiently to easily update the blog
User friendly
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Efficient
As ablogger, I want to post an entry to update the blog
nFR filters Reminders
Assign responsibles for each quality attr.
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New role, responsible for
QA to understand and
measure risk and assist in QA activities.
nFR ill-defined
Involving the customer is essential,
explaining the importance of
quality attributes.
General Issues Non-functional requirements
Stories quality filters.
Reminders
Assign responsibles for each quality attr.
Proposed solutions