1. Software Engi- neering Multi-person construction of multi-person software. 2. System Purposeful collection of interrelated components working together to achieve a common goal. 3. Requirements Engineering The process of eliciting: The services that the customer requires from a syst...
1 software engi neering multi person construction of multi person software 2 system purposeful collection of interrelated components working together to achieve a common goal 3 requi
Software Engineering
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1. Software Engi-
Multi-person construction of multi-person software.
neering
2. System Purposeful collection of interrelated components
working together to achieve a common goal.
3. Requirements The process of eliciting: The services that the
Engineering customer requires from a system. The constraints
under which it operates and is developed.
4. Requirements Descriptions of the system services and
constraints
that are generated during the requirement
engineering process.
5. User Require- Statements in natural language and diagrams of
ments the system services and operational constraints.
Written for customers, so it must use their
language and mental model. Understandable for
users who don't have detailed technical
knowledge. UML is your friend.
6. System
Require- ments A structured document setting out detailed
descriptions of the system's functions, services,
and operational con- straints. Defines what
should be implemented. Must be concise in their
7. Functional Re- technical effects.
quirements
Statements of services the system should
provide. How the system should react to
8. Examples of particular inputs. How the system should
Functional Re- behave in particular situation.
quirements
"A library system that provides a single interface
to a num- ber of databases of articles in different
libraries". "Users can search for and download
this articles for personal study". "Users shall be
able to search either all of the initial set of
9. Non-Functional databases or select a subset from it". "The
Requirements
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system shall
provide
appropriate
viewers for the
users to read
documents in the
document store".
These define
system
properties and
constraints.
Properties:
reliability,
response time,
storage
require-
ments.
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Constraints: security, legal impacts, domain expert
work- flow.
Process Requirements: (e.g.,) a particular
programming language.
10. Example of "The user interface for LIBSYS shall be
Non-Functional implemented as simple HTML without frames or
Requirements Java applets". "The
system shall not disclose any personal information
about customers apart from their name and their
registration identification number"."The system
architecture shall be constructed according to the
WC3 standards".
11. UML Unified Modelling Language: Standard language
for spec- ifying, visualising, constructing, and
documenting all the artefacts of a software
system during the software lifecy- cle.
12. UML Behaviour
Diagram al.
Types Functional.
Structural.
13. Behavioural Dia- Activity
grams Diagram.
State
Diagram.
14. Structural Sequence Diagram.
Dia- grams
Class
15. Functional Diagram.
Dia- grams Object
Diagram.
16. Use Case
Dia- gram Use Case Diagram
Functional.
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relationships between actors (interacting with
Visualise the system) and use cases (functionality).
4/
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