HCC12 Editorial

Introduction

Human Choice and Computers: An ever more intimate relationship

(freely available as a pdf ‘Front Matter‘ from Springer publications)

The context for HCC12

Since 1974, the Human Choice and Computers (HCC) conference series has firmly remained at the cutting edge of innovative thinking about the interface between the social and technology (Fig. 1). This observation should not be a surprising statement given that the central remit of IFIP’s Technical Committee 9 (TC9) is the relationship between computers and society. As Jacques Berleur, Magda Herschui and Lorenz Hilty related in their Introduction to the Proceedings of HCC9, “The success of HCC1 was such that IFIP-TC9 henceforth considered it the TC’s founding event, if not birthplace. TC9 was conceived in 1976, two years after HCC1.” [4]

This founding focus has been repeatedly explored throughout the forty-two year journey of HCC even surviving the difficult period documented by the third HCC conference proceedings [14]. The emerging distinctiveness of HCC conferences is highlighted by the fact that in 1986 it was the very nature, scope and purpose of the relationship between technology and people that was at the heart of an intensely critical and heated debate. In his introduction to HCC3, Sackman[1] chooses to remind an increasingly diverse readership of the ranked list of objectives for TC9 as:

  1.        Protection of Individual Rights
  2.        Employment and the Quality of Life
  3.        International Problem Solving
  4.        International Studies on Social Impacts
  5.        Professional Social Accountability
  6.        Universal Social Benefits
  7.        Protection of Group and Collective Rights
  8.        International Planning and Cooperation
  9.        International Education

Clearly, what has set HCC conferences apart is the critical perspective that is its hallmark.  HCC12 continues this tradition.  Cecez-Kecmanovic [7] identifies critical information systems research as being defined by a socially critical point of view, or, as Myers and Klein put it, IS research “can be classified as critical if the main task is seen as being one of social critique, whereby the restrictive and alienating conditions of the status quo are brought to light”[2]  This view is revealed in Sackman’s 1986 list which places the objective most likely to initiate “transformative social change” [7] at the head of the list.

To explore this history the editors of these proceedings used a contemporary textual analysis tool to examine the existing corpus of HCC texts: the prologue, introductions or key introductory chapters were analysed for identifiable trends. HCC6 was not included as it could not be located through the UK’s interlibrary loan system and HCC11 was not included due to its relatively brief prologue. Using optical character recognition to include the earlier conference introductions, the corpus was then processed through the voyant-tools website[3] to visualise the resulting trends. Figures 1-6 were produced in this way.

The Intertwined focus of technology and the social in HCC
Fig 1. The Intertwined focus of technology and the social in HCC

McGrath [10] confirmed the distinctiveness of HCC when she cited the proceedings of the first conference in 1974 as a watershed moment in the development of critical information systems thinking. The proceedings, she said, included an encouragement by editors Mumford and Sackman “to engage with the way that computer applications were being developed and deployed, and to make the human choices necessary to ensure that democratic values and ideals were preserved for the benefit of everyone”.[4] While Mumford and Sackman probably did not set out consciously to create this theoretical position, the critical focus and variety of challenges presented in the first conference were certainly a product of their time. An almost continuous concern with the position of labour, pressing union issues and the prevailing social theories of the time are peppered throughout the early proceedings of HCC.

Worker orientation is also possible, and a lot should and will be done. From a certain point on, however, too much adaptation will result in overspecialization and this will rebound back onto the worker in the form of career and position difficulties. Flexibility is a human virtue and should be cultivated.[5]

Our subject, therefore, is a matter far beyond computer sciences. It has to do with sociology, psychology, physiology, with the art of management and government, with democratic decision making as well as legal decision making and even creation of law. It must deal with the large field of problems with which the trade unions are faced. And it extends even into philosophy and religion – if Europe and America do not teach this, Islam certainly does these days.[6]

The various threads of what are now recognisable critical thinking in IS are developed more fully in later conference proceedings. In many cases, it is the small and offhand points made by earlier authors that became the pressing focus for later discussions. For example, Zemanek in 1979 [15] observed, “today we begin to realize how inseparable scientific and human development are.” and Margulies’ final footnote in 1979[7] struggled with, “whether we could leave out home computers from our discussions or not – they will probably affect our attitudes towards computers and thereby affect our professional life.” Margulies [16] started the first formalising of the critical thinking perspective of HCC by provocatively entitling his contribution – in a rare moment of editorial reflexivity for any conference – as “Why ‘HCC’ again?” and by then stating:

…technology must not become an end in itself, but has to be seen in the context of man. Throughout history man has developed new means of production in his unceasing endeavour to make work easier and life better, thus at the same time creating new ways of human cooperation and societal organisation. The tech­nology of today also can only be justified by its service to man, by its contribution in improving the quality of life, in providing the chance of self-realisation. [16]

In all of these early statements, with the benefit of hindsight, it is apparent that, with rapid evolution, adoption and popularisation, information technology was pressing nearer and nearer and becoming ever more intimately tied with the human condition. In 1986 Sackman working amidst the disruption of a fundamental ontological debate, identified major new forthcoming areas of concern for research that included – somewhat prophetically – “home information systems and social networking” and “robotics and artificial intelligence”[8]. While Barnes [2] is regarded as the originator of the term ‘social network’ this must be one of the first published instances of the term in relation to computers and information technology. This is an even more extraordinary statement when it is placed in the historical context of Dell Computers, the NSFNET (the first major TCP/IP network) and the WELL (the first digital community) all being only one year old in 1986.

With the increasing ubiquity and everyday presence of information technology, more recent HCC conferences have become less focused on work and more concerned with the general human situation including aspects of the personal and of the home (Fig. 2). This does not mean the original concerns of HCC have now somehow disappeared but rather that they have now become supplemented and richer, to incorporate the fuller interplay of public and private (Fig. 3) in ways that were not imagined or possible in the 1970s or 1980s.

Fig 2. The Intertwined focus of technology and the social in HCC
Fig. 3. Public vs Private through the HCC series.
Fig. 3. Public vs Private through the HCC series.

The spirit of HCC is consequently evident in the link tree of connected terms from the first HCC through to HCC10 held in 2012 (Fig. 4). The juxtaposition and mediating terms are themselves revealing of the intimate relationships between technology and people. “Information”, “Human” and “Social” sit at the centre of the diagram interlinking all the other concepts. Both “human systems” and “computer systems” are represented as is the classic “man machine” combination. “Human” and “Technology” are only sometimes mediated by the use of “policy” while “society”, “technology” and “people” sit in a triangular relationship revealing an interdependence that is acknowledged by many HCC papers through the years.

Fig. 4. Link tree of related terms generated from the entire HCC 1 to 10 corpus.
Fig. 4. Link tree of related terms generated from the entire HCC 1 to 10 corpus.

The ever closer intimacy of technology has generated a shift in attention from the rare and expensive hardware of processing in the form of “computers” to the more central object of the relationship between technology and people in the form of “information” (Fig. 5). With multiple devices constantly “near us” and “on us” (and soon “in us”) the question of what any single computer is doing or how it will be deployed becomes less significant than what “we” will do with the consequent information that is being generated by the many devices now available for us to access, interpret and use.

Fig. 5. Timeline of HCC1 to HCC10 proceedings with computers declining over time and information rising in significance (HCC 7 was dedicated to Rob Kling and this introduction is particularly rich in the use of the terms ‘information’ and ‘informatics’).
Fig. 5. Timeline of HCC1 to HCC10 proceedings with computers declining over time and information rising in significance (HCC 7 was dedicated to Rob Kling and this introduction is particularly rich in the use of the terms ‘information’ and ‘informatics’).
Fig. 6. The rise of ethical and ethics consideration in HCC.
Fig. 6. The rise of ethical and ethics consideration in HCC.

The rise of the importance of information at HCC also parallels an ‘ethical’ turn to the proceedings with rising attention commencing from HCC5. What Constantinides et al [8] might describe as progress towards the “ends” of Information Systems research. The patterns of critical research, as Richardson and Robertson point out, seem broadly to have settled into a three part format: insight, critique and transformative redefinition. Insight, “helps to highlight hidden or less obvious aspects of social reality;” critique, “challenges many of the taken-for-granted assumptions, beliefs, ideologies, discourses;” and transformative redefinition, “is the development of critical, relevant knowledge and practical understanding to facilitate emancipatory change”[9]. This ethical turn over the course of the HCC series, then, is in keeping with the transformative redefinition such critical research engenders.  As people are brought into closer constant communication with technology the issues of ethics and the ethical boundaries between “what can be done” and “what should be done” becomes a more pressing and more evident challenge to researchers. As the number of interfaces increases so too do the ethical challenges. As a long-standing conference series dedicated to critical information systems research, HCC is rightly staying true to its heritage by charting this increasing tension between the many possibilities that technology now enables, in contrast to what “we” as a society should be doing with these capabilities.

The final chapter of the first HCC proceedings, “reviews basic agreements, disagreements and recommendations generated by the papers”[10]. We now continue in the spirit of this tradition by taking a look towards the imminent future.

In the tradition of the previous HCC conferences, there is, in HCC12, an international spread of attendees, with authors representing South Africa, Germany, Slovenia, Australia, Norway, Britain, Japan, Canada, Italy, Denmark, Malaysia, Greece, Sweden, Ireland, and, interestingly, a large Finnish contingent.

HCC12: Technology and Intimacy

The theme for HCC12 is “Technology and Intimacy: Choice or coercion?”. A theme that came about when the editors recognised how often, during discussions about the conference, that each was using some form of mobile device to check a point of fact, ask questions of colleagues who were not in the room, to format a document or look up the details of a previous HCC conference. The immediacy and intimacy of this relationship with technology provided all the inspiration that was required.

Intimate technologies are now manifest in so many ways in the workplace, domestic environments, in transport, in defence, and through entertainment opportunities, with both similar and distinct impacts in the developed and in the developing world. (HCC12 Call For Papers)

From this statement came the inspiration for a series of prospective themes to prompt prospective authors. These were developed by the editors based on existing discussions found in a range of disciplines around technology and intimacy.

  • Intimacy – Location – Personal/Social – Wearables – Implantables – Data Manipulation
  • Personalisation – Identity – Digital Footprint – Gender
  • Marketing – User Experience – Human Computer Interaction & Design – Search and Social Media
  • Customisation – Material Culture – Innovation – Kit – Microchipping
  • Generations – Histories – Enabling Technologies
  • Geographies – Urban Technologies – Wayfaring
  • ICT for Development – Global Mobility – Developing Economies – Sustainability

Of course, while editors might speculate on what “their” conference will look like it is ultimately the authors who structure and shape the final experience and who now lay down the next layer in the historical record of HCC. The HCC12 papers present a number of common themes that all sit comfortably within the HCC tradition while also reflecting the impact of a changing digital landscape. A quick glance around any bus or train offers a fair indication of the extent to which society has overwhelmingly embraced an increasing myriad of devices for their information and entertainment consumption. The increasing range of venues and purposes for juxtaposing technology and people will continue to pose new dilemmas that require further theorised investigation.

The structure of the HCC12 proceedings endeavours to capture the essence of the themes that have been raised. Three broad themes emerged. Two of these themes reflect the current priorities of human computer interaction in the form of ethics and communications. The ethical questions being raised reflect the human aspects of human computer interaction while the communications discussions focus more heavily upon the technology side of the relationship.

The tradition of HCC is also preserved in the third theme of the conference in the form of consideration for the future and the recognition of emerging technologies that will present further new challenges to the intimacy of the human computer relationship.

As with any conference these themes are not mutually exclusive, or the sole set of concerns being expressed. There is, for example, a strong presence of theory with many authors explicitly positioning their work within the context of a recognisable intellectual tradition. Authors in this spirit include Koskinen and Kimppa (2016), Pan and Finken (2016), Padua (2016) and McKenna (2016). Many others also continue the HCC tradition of critical thinking with their strongly theorised work.

Ethics

The particularly sensitive area of healthcare information systems is examined by Koskinen and Kimppa (2016) in relation to the ownership of the voluminous and intimate information that these systems contain. Their theorised approach to the ethical issues raised by healthcare system enables them to provocatively propose an alternative solution that is labelled as Datenherrschaft.

Heimo et al (2016) continue this ethical attention to healthcare by considering the relatively new coupling of the potentially vulnerable and elderly with healthcare technologies and the gaming sector. The paper takes up the challenge of understanding the ethical issues of using a device – the Jumppatikku – that encourages activity in the elderly while also potentially exposing personally identifiable data to third parties. The nexus of data privacy and ensuring the security of the senior citizens provides a broad platform from which to interrogate the main ethical implications that are drawn out with new technologies.

Harvie et al (2016) continue this focus upon the elderly by looking at the use of assistive technology devices more broadly. Their discussion is positioned within the context of a generally aging population but is humanised through the use of a vignette of 85 year old Rose and her personal experiences with technology. Age, or rather generational difference, in the experience of technology is another recognisable theme through many of the conference’s papers.

The use of potentially beneficial technologies by the elderly is continued with Kwee-Meier et al (2016) who consider the very specific use-case of tracking wearables on a cruise ship. Their survey shows that the concerns for data privacy associated with the use of wearables is weighed against their perceived safety benefits by many users of these devices. Kwee-Meier et al (2016) also point to age as an important variable in determining these attitudes.

The importance of addressing the social isolation amongst the elderly is taken up by Hessey et al (2016) who discuss a specific assistive technology for the elderly that was trialled in Cornwall. The project brought Skype to the elderly through their existing televisions and endeavoured to alleviate some of the issues associated with being older. The project reveals the importance of user-informed design and the need for consideration of the many intersecting attitudinal issues associated with the use of technology.

The issues associated with  the elderly and people with dementia are also taken up by Kreps et al (2016) with a more conscious design perspective. The paper utilises the concept of skeuomorphic reassurance to present necessary design principles to inform the creation of technological artefacts for older users and for those with cognitive decline. The key principle employed in this paper is the need to reference antecedent designs in the creation of new and innovative technology products. Without this consideration the intended users are potentially left unable to access the benefits of technologies intended for them.

Botha et al (2016) also offer a solution in their paper to deal with the problem of leaking personal data. Drawing upon a South African legal situation to set their context they examine the issue of unintentionally revealing personally identifiable information. The work moves towards the development of a preventative solution that endeavours to prevent leakages of this type before they occur. A technological solution is required in order to manage the volume of information that must be filtered and for its accuracy in determining the leakage of “small” bits of data that are meaningful to a hacker but can be regularly missed with human filtering.

Ishii and Komukai (2016) also take the up ethical considerations for data through a legal perspective by comparing the situation in the US, UK and Japan regarding data breaches. Although framed within the legal context for dealing with these breaches the paper also reveals the extent to which social values, norms and perspectives are reflected in the experience and responses.

Iredale and Heinze (2016) examine the issues surrounding the professionalisation of Search Engine Optimisation. They consider how – or when – a move to professionalisation will occur. The paper takes the position that ethical consideration must be at the core of SEO work and that without this self-awareness and guiding set of principles associated with ethical behaviour the industry itself cannot become professional.

Vartiainen et al (2016) also look at the ethical issues in the professional world when they consider the sometimes fraught client-vendor relationship. Their survey identifies the competing series of variables that traditionally shape this type of relationship and they argue for the need to deploy new approaches. As with many of the papers that take up this ethical consideration for people and computers, Vartiainen et al (2016) advocate participatory design as a key ingredient in shaping an ethical and productive relationship.

Weijers et al (2016) round out the ethical theme by making the case for personalisation. Utilising the work of Ricoeur they argue to what extent the act of personalisation is itself an act of personhood and that in this act is an aggregation and shaping of person itself.

Communications

Kljun and Pucihar (2016) complement the paper offered by Hessey et al (2016) to take on the criticisms that technology can be a socially isolating experience to examine the prospects for using mobile technologies to initiate communications in public settings. As with so many of these conference papers, Kljun and Pucihar’s (2016) discussion also raises many ethical questions and points towards the clear value of participatory design.

Phahlamohlaka et al (2016) explore the value of secure ICT in the context of marginalised and developing economies. Particular attention is given to the role of ICTs as a mechanism for enabling economic activities. This is a complex problem within economies where many individuals do not have access to conventional banking mechanisms. However, success with this form of communications has the prospect of empowering individuals and entire communities.

Aligning with Phahlamohlaka et al’s (2016) argument and building a more specific focus, Pathirana and Khin (2016) also explore the relationship of communications in the form of the value of social media within the banking sector. The context for this work is the Sri Lankan situation. This paper also reflects the underlying theorised positioning of many papers by drawing on both the work of classic economists and the Technology Acceptance Model. This work also tackles the equally contested area of generational difference and the varying engagement between age groups of technology and financial services.

Pan and Finken (2016) offer a unique insight into the specialist area of marine technology by drawing upon Actor Network Theory and Computer Support Cooperative Work. Not only is a heavily theorised perspective again evident but so too does the argument for the use of participatory design emerge that can be found in the work of Kreps et al (2016) and Hessey et al (2016).

Haugsbakken (2016) looks at the role of “betas” in extending and legitimating the use of social media within organisation and professional life. The work is based around a theorised approach towards reflection and reflective practice that assists in shaping the framework that is outlined in this paper. Shaping the discussion around the role of “betas” also hints at the changing roles that people have within their professional life and offers a counterbalance to the discussion of professionalisation offered by Iredale and Heinze (2016).

The social networking and social media focus is narrowed down to Facebook by Pirli et al (2016) in a phenomenological study of the individuals users connections. Their examination of this particular social network also takes up the issue of generational differences in the use of technology by focusing on ‘adult Facebookers’ and their consociate connections.

The issues associated with privacy and ethical practices are reintroduced by Tarkkanen and Harkke (2016) in their examination of social networking sites. In contrast to the legal starting point of Ishii and Komukai (2016) and Botha et al (2016), the positioning for this paper is very much based around the traditions and practices of usability testing and human-computer interaction design.

The link with the ethical questions raised by personally identifying information is further addressed by Chutikulrungsee et al (2016). The focus in this work is upon “other-generated content” and the issues of disclosure that become possible through this use of social media. The work presents the challenges that are raised by using the concept of interdependent privacy and takes the position that this situation is inevitable. In engaging this challenge, Chutikulrungsee et al (2016) present the need for reconsidering how we perceive privacy through social networking sites.

Padua (2016) adheres closely to the overall theme for the conference by examining intimacy and the nearness of technology. In a wide arc that encompasses augmented reality, economics, recent political history and situational context theory the paper looks at the ever more intimate relationship that humans have with technology. This then opens up the opportunity to articulate a call for digital corporate social responsibility.

Augmented reality is then also the focus for Seppälä et al (2016) which they position within the context of cultural heritage and serious gaming. This development around a specific context draws upon the themes found in many of the conference papers. The design and user experience of the application is examined in a range of ways including the reception by different age groups and the opportunities for further participatory development.

Moving from cultural heritage to the fine arts, Pucihar et al (2016) take a different tack in their examination of communications technology by exploring the potential and prospects for virtual tracing using mobile devices. Their primary research shows the value and benefits to this specific task and points to a range of potential use-cases and applications.

Futures

Perhaps somewhat perversely we incorporate Tatnall’s (2016) historical examination of the State Computer Education Centre of Victoria within the Futures theme. The paper acts as a cautious tale for attempting to predict the future. The developments described by Tatnall (2016) echo the trajectory of development that can also be discerned within the context and history of the HCC conferences and reinforces the need for recent technological development to not be regarded ahistorically. Equally significant is the reminder built into the paper that attempts to foster a digitally literate society are by no means a new phenomenon.

Grbac et al (2016), in contrast, document a potential system for bringing together the virtual and the digital worlds into an intimate combination. Complementing the discussion offered by Pucihar et al (2016), a specific process for combining physical and digital annotations is proposed and unpicked to document and explain a very specific use-case for augmented reality.

Feiten et al (2016) also propose a system that complements the discussions of Heimo et al (2016), Botha et al (2016) and Weijers et al (2016). The outlined revocable anonymity approach rethinks much of the current views to online security and “other-generated content” (Chutikulrungsee et al 2016). The system proposed by Feiten et al (2016) is scrutinised from a range of perspectives including ethical, economic and legal points of view.

McKenna (2016) rounds out the collection with a rich description of a near present / near future city that is rich in human computer interfaces and “edges”. As Phahlamohlaka et al (2016) also point out, the interaction of technology and people is primarily an urban one and all current indications are that new developments in this area will continue to emerge from these spaces.

Of course, this is the editorial post hoc rationalisation of these many diverse papers. We encourage readers to explore alternative routes through these proceedings and to discover other new themes that are also contained inside.

 

References

(references marked with * were used in the corpus analysis of HCC conferences)

  1. * Avgerou, C., Smith, M. and van den Besselaar, P.: Human Choice and ICT Policy Policy: Introduction to the HCC8 Conference Proceedings. In Avgerou, C., Smith, M. and van den Besselaar, P. (eds) Social Dimensions of Information And Communication Technology Policy, Proceedings of the Eighth International Conference on Human Choice and Computers (HCC8), IFIP TC 9, Pretoria, South Africa, September 25-26, 2008. Springer. (2008)
  2. Barnes, J. A.: Class and Committees in a Norwegian Island Parish, Human Relations, 7(1), 39-58. (1954)
  3. * Beardon, C., Munari, S. and Rasmussen, L.: Prologue, In Rasmussen, L., Beardon, C. and Munari, S. (eds.) Computers and Networks in the Age of Globalization, Proceedings of the 5th IFIP-HCC (Human Choice and Computers) International Conference, HCC-5, Kluwer Academic Publishers, Boston. (2000)
  4. * Berleur, J. Hercheui, M.D. and Hilty, L. M.: What Kind of Information Society? Introduction to the HCC9 Conference proceedings, In Berleur, J. Hercheui, M.D. and Hilty, L. M. (eds) What Kind of Information Society? Governance, Virtuality, Surveillance, Sustainability, Resilience, 9th IFIP TC 9 International Conference, HCC9 2010 and 1st IFIP TC 11 International Conference, CIP 2010. Held as Part of WCC 2010, Brisbane, Australia, September 20-23, 2010. (2010)
  5. Brunnstein, K. and Berleur, J. (eds): Human Choice and Computers, Issues of Choice and Quality of Life in the Information Society, Proceedings of the IFIP-TC9 HCC-6 Conference, 17th World Computer Congress, Montreal, August 2002, Kluwer Academic Publishers. (2002)
  6. * Bryant, T.: The Myth of Information Society, In Berleur, J. & Drumm, J. (eds.) Information Technology Assessment: Human Choice and Computers, 4, Proceedings of the Fourth IFIP-TC9 International Conference on Human Choice and Computers (HCC-4), Dublin, July 8-12, 1990, Elsevier, North-Holland, Amsterdam. (1991)
  7. Cecez-Kecmanovic, D.: Doing critical information systems research – arguments for a critical research methodology, European Journal of Information Systems, 20(4), pp.440-455. (2011)
  8. Constantinides, P., Chaisson, M. and Introna, L.: The Ends of Information System Research: a pragmatic framework, MIS Quarterly, 36 (1), March, pp.1-19. (2012)
  9. Klein, H.K., and Myers, M.D.: A Set of Principles for Conducting and Evaluating Interpretive Field Studies in Information Systems, MIS Quarterly, (23:1), 67-93. (1999)
  10. McGrath, K.: Doing critical research in information systems: a case of theory and practice not informing each other, Information Systems Journal, 15, pp.85-101. (2005)
  11. * Mumford, E. & Sackman, H.: International Human Choice and Computers: Conference Retrospect and Prospect, in Mumford, E. & Sackman, H. (eds) Human Choice and Computers, Proceedings of the Conference on Human Choice and Computers (HCC-1), Vienna, Austria, April 1-5, 1974, Elsevier, North-Holland, Amsterdam, 1975. (1975)
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  13. Richardson, H., and Robinson, B.: The mysterious case of the missing paradigm: a review of critical information systems research, Information Systems Journal, (17:3), 251-270. (2007)
  14. * Sackman, H.: Historical Critique of IFIP TC 9: Computer Relationships with Society, In Sackman, H. (ed) Comparative Worldwide National Computer Policies, Proceedings of the 3rd IFIP-TC9 Conference on Human Choice and Computers, Stockholm (HCC-3), Sweden, 2-5 September 1985, Elsevier, North-Holland, Amsterdam. (1986)
  15. * Zemanek, H.: Human Choice – A subject of increasing general interest, In Mowshowitz, A. (ed) Human Choice and Computers 2, Proceedings of the Second IFIP-TC9 Human Choice and Computers Conference (HCC-2), Baden, Austria, 4-8 June, 1979, Elsevier, North-Holland, Amsterdam. (1980)
  16. Margulies, F.: Why ‘HCC’ again? In Zemanek, H.: Human Choice – A subject of increasing general interest, In Mowshowitz, A. (ed) Human Choice and Computers 2, Proceedings of the Second IFIP-TC9 Human Choice and Computers Conference (HCC-2), Baden, Austria, 4-8 June, 1979, Elsevier, North-Holland, Amsterdam. (1980)

[1] [14] p11

[2] [9] p69

[3] http://www.voyant-tools.org/

[4] [10] p87

[5] [15] pp16-17

[6] [16] p6

[7] [16] p16

[8] [14] p16

[9] [13] p255

[10] [11] pvi