Estudo de ergonomia e usabilidade

Estudo de ergonomia e usabilidade
Câmera DSLR Nikon D3100
features
good camera for beginners
is lightweight
more affordable price (under 2k real)
continuous shooting of 3 frames per
second
saved in RAW
records in full HD
battery lasts a long time
menu for beginners in the "guide" mode
detects up to 35 faces
Photo settings feature and effects
fulll HD video recording with up to 10
min
Audio receiver with good catch
It comes with a very versatile 18-55mm
lens
There is an entrance to wifi accessory
accepts old Nikon lenses
DSLR for whom?
Professional or amateur
photographer, working many
times in studios or open
areas
advanced
public
Sometimes they using
support equipment such as
flashes, reflectors, other
cameras and even team of
other professionals
They use the camera with
their maximum capacities
of hardware
They are loyal to the
product type and the brand
They have knowledge and
use manual settings and
shortcuts
New users and enthusiasts
in photography
beginner
public*
Public who came from new
technologies: familiar
with touchscreen media
and connectivity
Seeking in DSLR cameras
level up the skills in
shooting
They need a lot of
practice and study to
learn how to use
Concerns
The primary use of the camera
is the viewfinder eyepiece,
not the screen display
Too many buttons and
information causes confusion
and repulsion for new users
Key combinations to enable
features is not intuitive or
clear
In shooting options, there
isn’t a clear identification
of what can be edited in each
of them
Icons with similar meanings to
access different features
On your setup menu, lots of
choices and clicks are needed
until you find what you want
1. exploration test
2. Heuristic Evaluation
3. Validation Test*
Contextual Task Analysis
Exploration test
Interview and Think-Aloud activity
expectations
Confirm critical problems;
Do experiments to observe how users explore this critical functions;
Observe how knowledge and previous experience influence in these tasks;
Choose which path we should to do in evaluation.
Public
ID
Sex
Age
Professions
User type
Frequency
Situations
A
Woman
24
Design
student
Experient
Weekly
Party, family pictures,
travel, experiments, for
fun, for training
B
Woman
22
Design
student
Beginner
First time
Family pictures
C
Man
32
Mechanical
engineer
Beginner
First time
Family pictures
D
Man
62
Civil
engineer
Beginner
Sometimes
Family pictures, travel
E
Man
37
Computer
scientist
Beginner
Eventually
Party, family pictures,
travel,
Has a DSRL
camera - Nikon D
90
Using “Auto”
Mode
task 01
Put in "Portrait" mode,
turn off the flash and do
one or more photos.
task 02
Access the Advanced menu
and put a black and white
effect on one of the
images.
task 03
Select any photo to delete.
first
impressions
task 1
2 Users ignore
the task
One user seeking other ways
task 1
They even imagine
this shortcut
They don’t associate the icon
with the editing functions
task 2
They took time exploring all
functions until find the correct
category and effect
One user discovered a
new shortcut
task 3
They had no difficulty to do this task. Only two users
clicked "ok", which canceled the option.
Data Gathering
Task
Ligar a câmera e colocar no modo
retrato
User A
User B
User C
User D
User E
16”
14”
49” *
50” *
8”
3’27”
2’15”
**
**
3’40”
Fazer a foto
2”
4”
1’34”
12”
6”
Aplicar efeito preto e branco
15”
1’14”
57”
3’20”
45”
Deletar uma imagem
11”
8”
5”
20”
10”
4’11”
3’55”
3’25”
4’42”
4’49”
Desabilitar o flash
Tempos totais
* The C and D users select and hit the photo in "Auto without flash"
** They could not perform the task.
more critical task
Intuitiveness
◆
◆
requirements
Learnability
Memorability
Efficiency
◆
Accuracy (error handling
and recovery)
Subjective Perception
◆
Satisfaction
Competitive Analysis
Flash configuration
button is easy to
find, intuitive and
family use for the
user
Feedback to delete
all images just a
few clicks and
without a clear
error prevention
Easy to use for
beginners
photographers
OThe autofocus with
'live view' on is
very slow
Competitive Analysis
Use mirrorless new
technology, being
lighter and more
quickly between one
shot and another
Eye level finder
digital with lowresolution
Articulated 3-inch
display and high
quality
The mode 'Live View'
does not provide the
face detection
focus, only the
contrast detection
Set Usability
Goals
Usability Attribute Table
Group
User Characteristics
Tasks
Characteristics
Environment
Characteristics
Usability
Attributes
A
Homens e mulheres entre de 20 a 40
anos
Conhecimento básico em fotografia
Fotos de família,
viagens, outros
Indoor and outdoor
1.
2.
3.
4.
5.
Intuitividade
Eficiência
Familiaridade
Memorização
Satisfação
B
Mulheres entre de 20 a 40 anos
Conhecimento avançado em
fotografia
Fotos em festas,
fotos de família,
viagens,
experimentos, por
diversão, outros
Indoor and outdoor
1.
2.
3.
4.
5.
6.
Intuitividade
Eficiência
Flexibilidade
Memorização
Familiaridade
Satisfação
C
Homem de 65 anos
Conhecimento avançado em
fotografia
Pouca familiaridade com novas
tecnologias
Fotos fotos de
família, viagens,
outros
Indoor and outdoor
1.
2.
3.
4.
5.
Intuitividade
Eficiência
Familiaridade
Memorização
Satisfação
Reporting ‘Test Results’ with ‘Usability Attributes’
ID
Usability
Attributes
User
Group
Measuring Instrument
Value
to be
measur
ed
Performance Levels
Averag
e data
Unacce
ptable
Accept
able
Planned
Level
01
Intuitividade
Familiaridade
All
Task 01 A: ligar a
câmera, encontrar o modo
de foto ‘Retrato’, fazer
o disparo
Tempo
51”
2'23"
12”
8”
02
Eficiência
Intuitividade
Flexibilidade
All
Task 01 B: desabilitar o
flash
Tempo
3'08"
_ *
10”
4”
04
Eficiência
Familiaridade
All
Task 02: aplicar efeito
preto e branco
Tempo
1’18”
3’20”
15”
12”
05
Eficiência
All
Task 03: deletar imagens
Tempo
11”
20”
8”
5”
* Failed to perform the activity.
Evaluation system applied to
'Usability Specification Matrix'
Intuitiveness: How the user reacts to
information and buttons available in equipment;
how much they are able to explore functions
according to their previous experience and
knowledge.
Control: Domain and command perception.
Navigation: Interaction and understanding of
menus; understanding the location where they are
Interface: Clarity; objectivity; understanding
of iconography; quality of information.
Ergonomics: Handling; positioning when using
shooting; access to the buttons.
Feedback: Errors of understanding; understanding
of the commands to exit / cancel; instructions
for use.
Satisfaction: Pleased measure on the use and
handling of the equipment; satisfaction with the
results.
Usability Specification Matrix
Atributo
Grupo de
Usuários
Instrument
o de
medida
Níveis de desempenho
Avaliação dos concorrentes
Inaceitável
Mínimo
Planejad
o
Melhor
caso
Nikon
D3100
Nikon
Coolpix
P510
Nikon
D90
<5
6
9
8
5
8
6
Controle
<5
7
9
8
6
8
7
Navegação
<6
7
10
9
7
9
7
Interface
<6
7
9
8
8
8
8
Ergonomia
<6
7
9
8
8
7
8
Feedback
<4
7
8
9
7
9
9
Satisfação
<5
6
9
8
5
8
6
Intuitividade
Todos
All tasks
1. exploration test
2. Heuristic Evaluation
3. Validation Test*
Heuristic Evaluation
Based on 10 heuristics Jakob Nielsen
1. Aesthetic and minimalist design
2. Match between system lenguage and the real
world
3. Visibility of system status
4. Consistency and standards
5. Recognition rather than recall
6. User control and freedom
7. Error prevention
8. Help users recognize, diagnose, and recover
from errors
9. Flexibility and efficiency of use
10. Help and documentation
expectations
Evaluation test;
Point out which issues are most critical and need immediate adjustments to
improve the usability of the device;
Propose ideas and solutions, through a consensus of the evaluators.
Define usability improvements will be made.
Evaluators
ID
Sex
Age
Occupation
Level
Design student
Kind of equipment normally use
for shooting
Celular, point-and-shoot cameras
A
Woman
20
B
Man
24
Design student
Celular, point-and-shoot cameras
Leigo
C
Man
34
Public server
Celular
Leigo
D
Woman
24
Design student
Câmera DSLR Nikon D90
Intermediário
E
Woman
35
Designer de
interfaces freelancer
Câmera DSLR Nikon D3100,
celulares
Advanced
Leigo
degree of severity reported in heuristic evaluation
Heurística avaliada
Grau de severidade apontado pelos avaliadores
Fábia
Mayvom
Pablo
Raíssa
Virgínia
Critical
High
High
High
Critical
2. Match between system lenguage and
the real world
Low
High
High
High
Medium
3. Visibility of system status
Low
High
Medium
High
Critical
Medium
Critica
X
High
Critical
5. Recognition rather than recall
Low
High
Low
Medium
Medium
6. User control and freedom
Low
High
Low
Low
Low
7. Error prevention
Low
High
Low
Low
Low
8. Help users recognize, diagnose, and
recover from errors
Low
High
X
Medium
Low
9. Flexibility and efficiency of use
Low
Medium
X
X
Low
Medium
High
X
X
Medium
1. Aesthetic and minimalist design
4. Consistency and standards
10. Help and documentation
* Don’t answer
Critical priority
High priority
Medium priority
Ideas and solutions
1. exploration test
2. Heuristic Evaluation
3. Validation Test*
Thanks