SlideShare a Scribd company logo
1 of 8
[M0] 
genesis and evolution
HCI has the potential to change human behaviour 
HCI is transdisciplinar 
HCI emphasizes human values and goals 
HCI is vast 
Usability is a key issue in HCI 
HCI enables the extension of human capabilities 
HCI is a gap filler 
HCI is good in predicting the future, Alan Kay way 
HCI is about finding the perfect symbiosis between users and computer 
application 
HCI more than just concerned in the design of personal computer and it’s 
operating system 
HCI serves as a bridge between science and practice 
HCI build on human factors and cognitive sciences
Electrical Symbolical Textual Graphical Tangible 
Paul Dourish 
First analog 
computers where 
operations were 
directly encoded in 
it’s circuits which 
needed to be 
configured for each 
new task. 
There were no 
“users”, only 
programmers. 
First assembly 
languages appeared, 
that rendered 
machine level 
instructions into 
symbolic 
expressions. 
The actual interaction 
took still place with 
encoded punch 
cards, although the 
languages could 
already be 
considered textual. 
With the appearance 
of teletype machines 
and video terminals, 
the primary form of 
interaction became 
textual. 
This can be 
considered the origin 
of interactive 
computing - 
“interactive loop” in 
which the interaction 
became an endless 
back and forth loop 
of instruction and 
response between 
user and system. 
With the appearance 
of graphical UIs the 
interaction moved 
from the one 
dimensional stream 
of characters to a 
two dimensional 
space. 
The task of 
managing 
interaction became 
the task of 
managing space. 
Interaction directly 
through physical 
artifacts rather than 
graphical interfaces 
or classical input 
devices
focus on the properties 
of specific system 
components 
focus on tasks at 
hand 
focus on socially and materially 
embedded interactions 
John M. Carroll
1st Wave 2nd Wave 3rd Wave 
Susanne Bødker 
Rigid guidelines. 
Formal methods. 
Systematic testing. 
Focus on context and groups 
working with a collection of 
applications. 
Theories: situated action, 
distributed cognition and 
activity theory. 
Proactive methods: variety of 
participatory design 
workshops, prototyping and 
contextual inquiry, qualitative 
approaches studying use as it 
happens. 
Use of context and application types 
are broadened. Computers are 
increasingly being used in private 
and public spheres. Technology 
spreads from workplace to homes 
and everyday lives and culture. 
Theoretical focus on aesthetics, 
cultural level, cognitive expands into 
emotional, cultural, historical focus 
on experience. 
Methods moved away from 
commitment to users towards more 
exploratory take-it-or-leave it 
approach where designers seek 
inspiration from use.
Classical theories Modern theories Contemporary theories 
Yvonne Rogers 
Applying basic research. 
Cognitive modeling. 
Distributed cognition. 
Situated action. 
Ethnomethodology and 
ethnography. 
Activity theory. 
Grounded theory. 
Human values. 
Research in the wild. 
Turn to design, culture, 
embodiment.
Electrical Symbolical Textual Graphical Tangible 
1st Wave 2nd Wave 3rd Wave 
Classical theories Modern theories Contemporary theories

More Related Content

What's hot

Jessica Vitak, "When Contexts Collapse: Managing Self-Presentation Across Soc...
Jessica Vitak, "When Contexts Collapse: Managing Self-Presentation Across Soc...Jessica Vitak, "When Contexts Collapse: Managing Self-Presentation Across Soc...
Jessica Vitak, "When Contexts Collapse: Managing Self-Presentation Across Soc...
summersocialwebshop
 
Corneli
CorneliCorneli
Corneli
anesah
 
Resta tmg conference presentation
Resta tmg conference presentation Resta tmg conference presentation
Resta tmg conference presentation
Paul Resta
 
Knowledge lost in information, meanings lost in semantics?
Knowledge lost in information, meanings lost in semantics?Knowledge lost in information, meanings lost in semantics?
Knowledge lost in information, meanings lost in semantics?
Sophie Visser
 
Cybernetics big data_abrusci_15 novembre 2013
Cybernetics big data_abrusci_15 novembre 2013 Cybernetics big data_abrusci_15 novembre 2013
Cybernetics big data_abrusci_15 novembre 2013
Teresa Numerico
 
Ontologies dynamic networks of formally represented meaning1
Ontologies dynamic networks of formally represented meaning1Ontologies dynamic networks of formally represented meaning1
Ontologies dynamic networks of formally represented meaning1
STIinnsbruck
 

What's hot (20)

Learning Links
Learning LinksLearning Links
Learning Links
 
Context Aware User Modeling for Recommendation
Context Aware User Modeling for RecommendationContext Aware User Modeling for Recommendation
Context Aware User Modeling for Recommendation
 
Jessica Vitak, "When Contexts Collapse: Managing Self-Presentation Across Soc...
Jessica Vitak, "When Contexts Collapse: Managing Self-Presentation Across Soc...Jessica Vitak, "When Contexts Collapse: Managing Self-Presentation Across Soc...
Jessica Vitak, "When Contexts Collapse: Managing Self-Presentation Across Soc...
 
AtGentive: Attentive Agents for Collaborative Learners
AtGentive: Attentive Agents for Collaborative LearnersAtGentive: Attentive Agents for Collaborative Learners
AtGentive: Attentive Agents for Collaborative Learners
 
Corneli
CorneliCorneli
Corneli
 
Communication design and theories of learning
Communication design and theories of learningCommunication design and theories of learning
Communication design and theories of learning
 
Resta tmg conference presentation
Resta tmg conference presentation Resta tmg conference presentation
Resta tmg conference presentation
 
Constructivist PLE
Constructivist PLEConstructivist PLE
Constructivist PLE
 
Engagement, Flow, Presence
Engagement, Flow, PresenceEngagement, Flow, Presence
Engagement, Flow, Presence
 
Starbucks
StarbucksStarbucks
Starbucks
 
Flexible PLEs with Netbooks
Flexible PLEs with NetbooksFlexible PLEs with Netbooks
Flexible PLEs with Netbooks
 
Smiljana Antonijevic - Second Life, Second Body
Smiljana Antonijevic - Second Life, Second BodySmiljana Antonijevic - Second Life, Second Body
Smiljana Antonijevic - Second Life, Second Body
 
Ethnographic Services
Ethnographic ServicesEthnographic Services
Ethnographic Services
 
Presentation_DAI
Presentation_DAIPresentation_DAI
Presentation_DAI
 
Knowledge lost in information, meanings lost in semantics?
Knowledge lost in information, meanings lost in semantics?Knowledge lost in information, meanings lost in semantics?
Knowledge lost in information, meanings lost in semantics?
 
Cybernetics big data_abrusci_15 novembre 2013
Cybernetics big data_abrusci_15 novembre 2013 Cybernetics big data_abrusci_15 novembre 2013
Cybernetics big data_abrusci_15 novembre 2013
 
Ontologies dynamic networks of formally represented meaning1
Ontologies dynamic networks of formally represented meaning1Ontologies dynamic networks of formally represented meaning1
Ontologies dynamic networks of formally represented meaning1
 
2012.03 social neuroscience for investigating social interaction in entrepris...
2012.03 social neuroscience for investigating social interaction in entrepris...2012.03 social neuroscience for investigating social interaction in entrepris...
2012.03 social neuroscience for investigating social interaction in entrepris...
 
Producing an Authentic Context in Virtual Training Environments in Hazardous ...
Producing an Authentic Context in Virtual Training Environments in Hazardous ...Producing an Authentic Context in Virtual Training Environments in Hazardous ...
Producing an Authentic Context in Virtual Training Environments in Hazardous ...
 
Understanding interaction context for development interactive models
Understanding interaction context for development interactive modelsUnderstanding interaction context for development interactive models
Understanding interaction context for development interactive models
 

Viewers also liked (10)

CoCreat
CoCreatCoCreat
CoCreat
 
Imke presentation-november-2012
Imke presentation-november-2012Imke presentation-november-2012
Imke presentation-november-2012
 
EstCHI
EstCHIEstCHI
EstCHI
 
Mobile Interactions
Mobile InteractionsMobile Interactions
Mobile Interactions
 
IFI7159 M1
IFI7159 M1IFI7159 M1
IFI7159 M1
 
Introduction and Theoretical Foundations of New Media
Introduction and Theoretical Foundations of New MediaIntroduction and Theoretical Foundations of New Media
Introduction and Theoretical Foundations of New Media
 
Design issues and processes
Design issues and processesDesign issues and processes
Design issues and processes
 
A Dissertação de Mestrado
A Dissertação de MestradoA Dissertação de Mestrado
A Dissertação de Mestrado
 
Metadata and ontologies
Metadata and ontologiesMetadata and ontologies
Metadata and ontologies
 
IFI7159 M2
IFI7159 M2IFI7159 M2
IFI7159 M2
 

Similar to IFI7159 M0

As we may feel - PhD presentation
As we may feel - PhD presentationAs we may feel - PhD presentation
As we may feel - PhD presentation
Martin Christensen
 
The Mind Cupola And Enactive Ecology
The Mind Cupola And Enactive Ecology The Mind Cupola And Enactive Ecology
The Mind Cupola And Enactive Ecology
zicsresearch
 
Introduction to HCI
Introduction to HCI Introduction to HCI
Introduction to HCI
Deskala
 
Multimodal and Affective Human Computer Interaction - Abhinav Sharma
Multimodal and Affective Human Computer Interaction - Abhinav SharmaMultimodal and Affective Human Computer Interaction - Abhinav Sharma
Multimodal and Affective Human Computer Interaction - Abhinav Sharma
Abhinav Sharma
 
Master of Exhibit Design at La Sapienza University, Introduction and Lesson 1
Master of Exhibit Design at La Sapienza University, Introduction and Lesson 1Master of Exhibit Design at La Sapienza University, Introduction and Lesson 1
Master of Exhibit Design at La Sapienza University, Introduction and Lesson 1
Salvatore Iaconesi
 
A case study analysis on digital convergent design: Skynet Platform
A case study analysis on digital convergent design: Skynet PlatformA case study analysis on digital convergent design: Skynet Platform
A case study analysis on digital convergent design: Skynet Platform
di8it
 
Nethood Aesop09 Liverpool
Nethood Aesop09 LiverpoolNethood Aesop09 Liverpool
Nethood Aesop09 Liverpool
nethood
 

Similar to IFI7159 M0 (20)

As we may feel - PhD presentation
As we may feel - PhD presentationAs we may feel - PhD presentation
As we may feel - PhD presentation
 
The Mind Cupola And Enactive Ecology
The Mind Cupola And Enactive Ecology The Mind Cupola And Enactive Ecology
The Mind Cupola And Enactive Ecology
 
Introduction to HCI
Introduction to HCI Introduction to HCI
Introduction to HCI
 
Introduction To HCI
Introduction To HCIIntroduction To HCI
Introduction To HCI
 
Hci activity#1
Hci activity#1Hci activity#1
Hci activity#1
 
Multimodal and Affective Human Computer Interaction - Abhinav Sharma
Multimodal and Affective Human Computer Interaction - Abhinav SharmaMultimodal and Affective Human Computer Interaction - Abhinav Sharma
Multimodal and Affective Human Computer Interaction - Abhinav Sharma
 
Master of Exhibit Design at La Sapienza University, Introduction and Lesson 1
Master of Exhibit Design at La Sapienza University, Introduction and Lesson 1Master of Exhibit Design at La Sapienza University, Introduction and Lesson 1
Master of Exhibit Design at La Sapienza University, Introduction and Lesson 1
 
Human centered computing
Human centered computing Human centered computing
Human centered computing
 
Interface Design
Interface DesignInterface Design
Interface Design
 
Agents for Intelligence Learning
Agents for Intelligence LearningAgents for Intelligence Learning
Agents for Intelligence Learning
 
How Cognitive Science Has Influenced the Applied Science of HCI “The evolutio...
How Cognitive Science Has Influenced the Applied Science of HCI “The evolutio...How Cognitive Science Has Influenced the Applied Science of HCI “The evolutio...
How Cognitive Science Has Influenced the Applied Science of HCI “The evolutio...
 
HCI2010_2.pdf
HCI2010_2.pdfHCI2010_2.pdf
HCI2010_2.pdf
 
HCI2010.pdf
HCI2010.pdfHCI2010.pdf
HCI2010.pdf
 
A case study analysis on digital convergent design: Skynet Platform
A case study analysis on digital convergent design: Skynet PlatformA case study analysis on digital convergent design: Skynet Platform
A case study analysis on digital convergent design: Skynet Platform
 
Studying perceptions of urban space and neighbourhood with moblogging
Studying perceptions of urban space and neighbourhood with mobloggingStudying perceptions of urban space and neighbourhood with moblogging
Studying perceptions of urban space and neighbourhood with moblogging
 
Musstanser Avanzament 4 (Final No Animation)
Musstanser   Avanzament 4 (Final   No Animation)Musstanser   Avanzament 4 (Final   No Animation)
Musstanser Avanzament 4 (Final No Animation)
 
Human computer interaction
Human computer interactionHuman computer interaction
Human computer interaction
 
A paper on HCI by Nalaemton and Mervin
A paper on HCI by Nalaemton and MervinA paper on HCI by Nalaemton and Mervin
A paper on HCI by Nalaemton and Mervin
 
Nethood Aesop09 Liverpool
Nethood Aesop09 LiverpoolNethood Aesop09 Liverpool
Nethood Aesop09 Liverpool
 
Interaction Paradigms
Interaction ParadigmsInteraction Paradigms
Interaction Paradigms
 

More from David Lamas

Metodologias e métodos de investigação
Metodologias e métodos de investigaçãoMetodologias e métodos de investigação
Metodologias e métodos de investigação
David Lamas
 
TLU, Institute of Informatics presentation industry partners
TLU, Institute of Informatics presentation industry partnersTLU, Institute of Informatics presentation industry partners
TLU, Institute of Informatics presentation industry partners
David Lamas
 
Timeliner: Early Ideas
Timeliner: Early IdeasTimeliner: Early Ideas
Timeliner: Early Ideas
David Lamas
 

More from David Lamas (18)

Welcome
WelcomeWelcome
Welcome
 
Paper Prototype Evaluation
Paper Prototype EvaluationPaper Prototype Evaluation
Paper Prototype Evaluation
 
Paper Prototyping
Paper PrototypingPaper Prototyping
Paper Prototyping
 
Metodologias e métodos de investigação
Metodologias e métodos de investigaçãoMetodologias e métodos de investigação
Metodologias e métodos de investigação
 
Interaction styles
Interaction stylesInteraction styles
Interaction styles
 
Interactive Media
Interactive MediaInteractive Media
Interactive Media
 
TLU, Institute of Informatics presentation industry partners
TLU, Institute of Informatics presentation industry partnersTLU, Institute of Informatics presentation industry partners
TLU, Institute of Informatics presentation industry partners
 
IMKE: The internationalization challenge
IMKE: The internationalization challengeIMKE: The internationalization challenge
IMKE: The internationalization challenge
 
Experimental Input and Output
Experimental Input and OutputExperimental Input and Output
Experimental Input and Output
 
Interactive Digital Media
Interactive Digital MediaInteractive Digital Media
Interactive Digital Media
 
Timeliner: Early Ideas
Timeliner: Early IdeasTimeliner: Early Ideas
Timeliner: Early Ideas
 
Accessibility, Usability and User Centred Design (User centred design)
Accessibility, Usability and User Centred Design (User centred design)Accessibility, Usability and User Centred Design (User centred design)
Accessibility, Usability and User Centred Design (User centred design)
 
Accessibility, Usability and User Centred Design (Usability workshop)
Accessibility, Usability and User Centred Design (Usability workshop)Accessibility, Usability and User Centred Design (Usability workshop)
Accessibility, Usability and User Centred Design (Usability workshop)
 
Accessibility, Usability and User Centred Design (Usabiltiy)
Accessibility, Usability and User Centred Design (Usabiltiy)Accessibility, Usability and User Centred Design (Usabiltiy)
Accessibility, Usability and User Centred Design (Usabiltiy)
 
Accessibility, Usability and User Centred Design (Accessibility)
Accessibility, Usability and User Centred Design (Accessibility)Accessibility, Usability and User Centred Design (Accessibility)
Accessibility, Usability and User Centred Design (Accessibility)
 
Accessibility, Usability and User Centred Design (introduction)
Accessibility, Usability and User Centred Design (introduction)Accessibility, Usability and User Centred Design (introduction)
Accessibility, Usability and User Centred Design (introduction)
 
Accessibility, Usability and User Centred Design (Accessibility workshop)
Accessibility, Usability and User Centred Design (Accessibility workshop)Accessibility, Usability and User Centred Design (Accessibility workshop)
Accessibility, Usability and User Centred Design (Accessibility workshop)
 
Interacção Homem-Máquina (introdução)
Interacção Homem-Máquina (introdução)Interacção Homem-Máquina (introdução)
Interacção Homem-Máquina (introdução)
 

Recently uploaded

Making and Justifying Mathematical Decisions.pdf
Making and Justifying Mathematical Decisions.pdfMaking and Justifying Mathematical Decisions.pdf
Making and Justifying Mathematical Decisions.pdf
Chris Hunter
 
Seal of Good Local Governance (SGLG) 2024Final.pptx
Seal of Good Local Governance (SGLG) 2024Final.pptxSeal of Good Local Governance (SGLG) 2024Final.pptx
Seal of Good Local Governance (SGLG) 2024Final.pptx
negromaestrong
 
The basics of sentences session 3pptx.pptx
The basics of sentences session 3pptx.pptxThe basics of sentences session 3pptx.pptx
The basics of sentences session 3pptx.pptx
heathfieldcps1
 

Recently uploaded (20)

Making and Justifying Mathematical Decisions.pdf
Making and Justifying Mathematical Decisions.pdfMaking and Justifying Mathematical Decisions.pdf
Making and Justifying Mathematical Decisions.pdf
 
Asian American Pacific Islander Month DDSD 2024.pptx
Asian American Pacific Islander Month DDSD 2024.pptxAsian American Pacific Islander Month DDSD 2024.pptx
Asian American Pacific Islander Month DDSD 2024.pptx
 
Seal of Good Local Governance (SGLG) 2024Final.pptx
Seal of Good Local Governance (SGLG) 2024Final.pptxSeal of Good Local Governance (SGLG) 2024Final.pptx
Seal of Good Local Governance (SGLG) 2024Final.pptx
 
General Principles of Intellectual Property: Concepts of Intellectual Proper...
General Principles of Intellectual Property: Concepts of Intellectual  Proper...General Principles of Intellectual Property: Concepts of Intellectual  Proper...
General Principles of Intellectual Property: Concepts of Intellectual Proper...
 
How to Give a Domain for a Field in Odoo 17
How to Give a Domain for a Field in Odoo 17How to Give a Domain for a Field in Odoo 17
How to Give a Domain for a Field in Odoo 17
 
ICT role in 21st century education and it's challenges.
ICT role in 21st century education and it's challenges.ICT role in 21st century education and it's challenges.
ICT role in 21st century education and it's challenges.
 
Micro-Scholarship, What it is, How can it help me.pdf
Micro-Scholarship, What it is, How can it help me.pdfMicro-Scholarship, What it is, How can it help me.pdf
Micro-Scholarship, What it is, How can it help me.pdf
 
The basics of sentences session 3pptx.pptx
The basics of sentences session 3pptx.pptxThe basics of sentences session 3pptx.pptx
The basics of sentences session 3pptx.pptx
 
Unit-V; Pricing (Pharma Marketing Management).pptx
Unit-V; Pricing (Pharma Marketing Management).pptxUnit-V; Pricing (Pharma Marketing Management).pptx
Unit-V; Pricing (Pharma Marketing Management).pptx
 
psychiatric nursing HISTORY COLLECTION .docx
psychiatric  nursing HISTORY  COLLECTION  .docxpsychiatric  nursing HISTORY  COLLECTION  .docx
psychiatric nursing HISTORY COLLECTION .docx
 
Class 11th Physics NEET formula sheet pdf
Class 11th Physics NEET formula sheet pdfClass 11th Physics NEET formula sheet pdf
Class 11th Physics NEET formula sheet pdf
 
Advanced Views - Calendar View in Odoo 17
Advanced Views - Calendar View in Odoo 17Advanced Views - Calendar View in Odoo 17
Advanced Views - Calendar View in Odoo 17
 
Nutritional Needs Presentation - HLTH 104
Nutritional Needs Presentation - HLTH 104Nutritional Needs Presentation - HLTH 104
Nutritional Needs Presentation - HLTH 104
 
Presentation by Andreas Schleicher Tackling the School Absenteeism Crisis 30 ...
Presentation by Andreas Schleicher Tackling the School Absenteeism Crisis 30 ...Presentation by Andreas Schleicher Tackling the School Absenteeism Crisis 30 ...
Presentation by Andreas Schleicher Tackling the School Absenteeism Crisis 30 ...
 
Ecological Succession. ( ECOSYSTEM, B. Pharmacy, 1st Year, Sem-II, Environmen...
Ecological Succession. ( ECOSYSTEM, B. Pharmacy, 1st Year, Sem-II, Environmen...Ecological Succession. ( ECOSYSTEM, B. Pharmacy, 1st Year, Sem-II, Environmen...
Ecological Succession. ( ECOSYSTEM, B. Pharmacy, 1st Year, Sem-II, Environmen...
 
Z Score,T Score, Percential Rank and Box Plot Graph
Z Score,T Score, Percential Rank and Box Plot GraphZ Score,T Score, Percential Rank and Box Plot Graph
Z Score,T Score, Percential Rank and Box Plot Graph
 
Grant Readiness 101 TechSoup and Remy Consulting
Grant Readiness 101 TechSoup and Remy ConsultingGrant Readiness 101 TechSoup and Remy Consulting
Grant Readiness 101 TechSoup and Remy Consulting
 
Measures of Dispersion and Variability: Range, QD, AD and SD
Measures of Dispersion and Variability: Range, QD, AD and SDMeasures of Dispersion and Variability: Range, QD, AD and SD
Measures of Dispersion and Variability: Range, QD, AD and SD
 
Role Of Transgenic Animal In Target Validation-1.pptx
Role Of Transgenic Animal In Target Validation-1.pptxRole Of Transgenic Animal In Target Validation-1.pptx
Role Of Transgenic Animal In Target Validation-1.pptx
 
Introduction to Nonprofit Accounting: The Basics
Introduction to Nonprofit Accounting: The BasicsIntroduction to Nonprofit Accounting: The Basics
Introduction to Nonprofit Accounting: The Basics
 

IFI7159 M0

  • 1. [M0] genesis and evolution
  • 2. HCI has the potential to change human behaviour HCI is transdisciplinar HCI emphasizes human values and goals HCI is vast Usability is a key issue in HCI HCI enables the extension of human capabilities HCI is a gap filler HCI is good in predicting the future, Alan Kay way HCI is about finding the perfect symbiosis between users and computer application HCI more than just concerned in the design of personal computer and it’s operating system HCI serves as a bridge between science and practice HCI build on human factors and cognitive sciences
  • 3.
  • 4. Electrical Symbolical Textual Graphical Tangible Paul Dourish First analog computers where operations were directly encoded in it’s circuits which needed to be configured for each new task. There were no “users”, only programmers. First assembly languages appeared, that rendered machine level instructions into symbolic expressions. The actual interaction took still place with encoded punch cards, although the languages could already be considered textual. With the appearance of teletype machines and video terminals, the primary form of interaction became textual. This can be considered the origin of interactive computing - “interactive loop” in which the interaction became an endless back and forth loop of instruction and response between user and system. With the appearance of graphical UIs the interaction moved from the one dimensional stream of characters to a two dimensional space. The task of managing interaction became the task of managing space. Interaction directly through physical artifacts rather than graphical interfaces or classical input devices
  • 5. focus on the properties of specific system components focus on tasks at hand focus on socially and materially embedded interactions John M. Carroll
  • 6. 1st Wave 2nd Wave 3rd Wave Susanne Bødker Rigid guidelines. Formal methods. Systematic testing. Focus on context and groups working with a collection of applications. Theories: situated action, distributed cognition and activity theory. Proactive methods: variety of participatory design workshops, prototyping and contextual inquiry, qualitative approaches studying use as it happens. Use of context and application types are broadened. Computers are increasingly being used in private and public spheres. Technology spreads from workplace to homes and everyday lives and culture. Theoretical focus on aesthetics, cultural level, cognitive expands into emotional, cultural, historical focus on experience. Methods moved away from commitment to users towards more exploratory take-it-or-leave it approach where designers seek inspiration from use.
  • 7. Classical theories Modern theories Contemporary theories Yvonne Rogers Applying basic research. Cognitive modeling. Distributed cognition. Situated action. Ethnomethodology and ethnography. Activity theory. Grounded theory. Human values. Research in the wild. Turn to design, culture, embodiment.
  • 8. Electrical Symbolical Textual Graphical Tangible 1st Wave 2nd Wave 3rd Wave Classical theories Modern theories Contemporary theories