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GCSE CCEA Digital Technology/ICT: Unit 2 Complete set of notes
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TOPIC 1:Designingsolutions:
End user:the who will be the system
person using
When it is created.
·
they will work with developers to create
list of feedback
a user
requirements and provide
throughoutthe process.
TargetAudience
thedemographicgoop whowillsee
Ethnicitylevel congrass Gender
Factor
regarding
T.A.
Computer experience Age range
·
Purpose
Document: provides
User Requirements a list of
systems requirements
needed to ensure
system operation.
effective
Requirements be:
must 1) measurable
-
within
budget
and time
2) to understand for the end user.
easy
ProjectDevelopment
Waterfall Iterative
model.Atfirst, a quith basic model the
of
approach wherearepleted productis produced.
Model Sequential final In next
the
a series of
stages Iteration, steps are repeated, more features added
in a fixed order, each stage must be completed before
the next
this centres until completion.
Testing o
testing take
does not
place until
Testing:
otests carried ateach
out
development
stayt
after system has been designed is
implemented ·
This ensures
bugs and mistakes are
detected and corrected early on
·very to
difficult make changes. of correction
a reduces cost
leave anything cut.
·less likes to
,WhatIS PROTOTYPING? · ae
initial version ofa system
being developed.
·rested constantfeedback from
following
the end user to make sure it
meets the end user's requirements.
The two
types prototyping: of
EVOLUTIONARY THROWAWAX
·incomplete version the final system
of s
·prototype will notbe part of final solution.
and to the end user.
developed presented ·
model
ice
system
of
between
is
der
developed
and
to help supportdiscuss -
end used
·
cycle review, feedback
of and refinement
othis helps develop an accurate of
list user requirements
repeated until end user is
presented with a
Patter two,
requirements. prototype discarded and
is
system meets
that all their user new
system is
developed.
Advantages ofprototyping:
I reduces between and user and developer.
⑥ Errors
misunderstandings
be detected reduces of
cost correction.
can
early
-
~ Enables and user to provide continuous feedback.
Disadvantages prototyping
of
X
Prototyping can lead to constant
changing user
of requirements, increases size, time costs
X Unreal expectations about development
progress.
X Not
suited to all
types applications larger projects.
-
of
, TOPIC: Digital Developmentconsiderations.
Graphical user interface (601) vallows interactions
through
the selective on-screen
of
GUI uses a W.1.M.P. Interface options
Windows performed provides
showing actions Windows, ICONS, MENUS
a
-
areaon screen
by an application. and so thatthe user can
POINTERS
Icons -
picture or to
symbolorusedhardware. operate
representa shortcut
it
to a task, app,
from can choose
listed group options
of which user
Menus-whattherequire.
Pointers -
symbol on screen which tracks actions made
device.
input
using an
-
of GUI
Advantages a
⑥ Intuitive and user
friendly
⑥ Don't here to learn
complicated instructions
5 shortcuts help increase speed of
operation
Disadvantages ofa ful
↑
Require more
GPUs
storage, processing power and RAM.
x Powerful needed
can be
X restrictive for expertusers
Natural Interfaces: Provides
Language digital
·
interaction with
sound card are required to support
technology through using their
N.T. Microphone and
N.L. 1. speech or
type instructions
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