Communication and Media Richness Assurance in High-performance Projects

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In Communication, the term media richness (or information richness) refers to the amount of information a medium is capable of transmitting per given time unit.

Contents

Abstract

With a plethora of available communication tools and often high degrees of freedom in their timing, choosing the right tool at the right time is non-trivial. Depending on the choice of tools and timing, results will vary from excellent through acceptable to undesired. However, as no universally successful recipe exists for ensuring positive outcomes, having a good understanding of the various communication options and their attributes will increase chances of making rational decisions accumulated and translating in turn into complex, fit-for-purpose solutions.

This article seeks to help project practitioners gain awareness of different communication tools and approaches from a multi-disciplinary perspective. Disciplines covered are biology, psychology, mathematics, science and history, with use of case studies and best practice. The diverse angles on the topic come together to bring a unified, in-depth understanding of media richness assurance aiding practitioners to achieve better results in their practical application in project implementations.

A key concept discussed in the article is Media Richness Theory (MRT), or Information Richness Theory. MRT describes how various communication media, such as face-to-face interaction and email correspondence, have different characteristics in terms of their information capacity and transfer rate as well as notable advantages and disadvantages.

Based on MRT, three case studies will be discussed to analyse chosen communication methods and approaches in relation to project implementation. Conclusions from the case studies will guide the final article summary.

Introduction

Organisations rely on communication to successfully complete tasks (typically organised in projects) and fulfil purposes. Since success is typically measured on a linear scale, any overall project success could be considered the sum of a series of intermediary successes. Project purpose fulfilment thus quite simply relies on good stakeholder communication on a continuous basis throughout the entire project lifecycle.

What separates standard projects from high-performing projects is that in the latter communication effectiveness becomes vital not only regarding accuracy but also for speed. In other words, communication needs to happen both precisely and quickly, allowing superb utilisation of project resources to create outstanding project results.

Given the critical role of communication in high-performance projects, the question is ‘how does one go about designing and executing this complex project system of communication?’. As Daft and Lengel universally put it, "How do organizations perform this miracle?" [1]

Human Nature

To truly understand later developments and higher-abstraction processes and terminology, one must journey back to the basics at the source and core meanings of the topic: Human beings are born with five senses: sight, hearing, touch, smell and taste. These senses are designed not only for survival (securing life necessities) but also to enable us to communicate with our surroundings to yield better results in numerous respects. In essence, our choice of senses can be considered a toolbox that we make use of in various ways in order to carry out tasks and fulfil purposes. The way in which we relate to and make use of this toolbox sees us entering the domain of psychology: from a number of available options we make a given decision that employs one or more senses and then subsequently take appropriate action. These thought processes started out in history among primates as survival-prioritised ('there is food straight ahead, so I will move in that direction in order to get and eat it'), but have through time evolved substantially to highly complex, human decision-making patterns ('there is food straight ahead, but information tells me there is better food a little further on, so I will go there instead to eat). As evident in both scenarios, human biology is coupled with psychology through decision-making. In the latter, however, richer communication is present resulting in greater overall benefit.

Organisational Psychology

Organisations formed by coalitions of human beings have existed for several thousand years, yielding tremendous benefits on a grand scale. For example, the ancient Greek and Romans erected monumental structures [2] which would have never been possible without cooperation through communication.

Colosseum, Rome: an example of a monumental structure crafted in early times (70-80 A.D.) through communication and collaboration[3]

As with individual human psychological evolution, the psychology employed in traditional organisations evolved over time into a higher-complexity field as seen in modern organisations. Evolution in technology, human and material resources, infrastructure and health collectively caused an explosion in size and resolution of the overall decision-making landscape. There are now many times more key decision-makers in each organisation and an astronomical amount of organisation-level decisions made daily across the global business community. The refined effect of this on psychological factors is that decision-makers have access to an overwhelming amount of information and communication options yet continue to have the same mere five basic human senses. A way that modern organisations deal with this severely unfavourable interface misalignment is to employ processes, policies and communication protocols to continually aid decision-making mechanisms. This places emphasis on organisation stakeholders to learn and appropriately interact with the organisational framework, but in return offers reduced levels of uncertainty achieved through somewhat guided focus. As Jacobsen and Thorsvik put it, "organisations are selective in their search for information and shield themselves against different types of information".[4]

Information Media

In today's digital world an endless array of communication media exists for people to utilise. This immediately poses a threat to both efficiency and effectiveness, since communication is a continuous process and people therefore potentially could invest huge amounts of resources in communication with only an acceptable (or even little) amount of gain. Complimentarily, if communication media are used appropriately this vast selection of tools some of which could be considered extremely powerful could mean historically unprecedented opportunities for achieving world-leading project results.

The list below comprises some key communication media, categorised broadly based on their information/data transfer capabilities (quality of the data stream, categorised by fidelity[5] and measured in bits per second; bps).

Fidelity Medium Timing Transfer rate (typical) - primary data Transfer rate (typical) - secondary data Primary data type Secondary data type(s) Maximum senses engaged Conversation party size (typical)
High Face-to-face conversation Synchronous 9,216,000,000[6] 99,500,000,000+[7](limited to 1080p quality) Audio Video 5 2-4
Video conferencing Synchronous 128,000[8] 1,977,000[9] Audio Video 2 4-15
Medium Telephone calling Synchronous 12,200[10] (3G connection) - Audio - 1 2
Audio conferencing Synchronous 128,000[8] - Audio - 1 4-15[11]
Internet messaging/chat Asynchronous 1[12] (based on 4 characters typed per second) 500,000[13] (min. recommended rate for most demanding medium: video) Text Mixed media 2 2-4
Email correspondence Asynchronous 1[12] (based on 4 characters typed per second) 500,000[13] (min. recommended rate for most demanding medium: video) Text Mixed media 2 2-5
Low Multimedia messaging (MMS) Asynchronous 1[12] (based on 4 characters typed per second) 12,200[10] (3G connection) Text Mixed media 2 2
Text messaging (SMS) Asynchronous 1[12] (based on 4 characters typed per second) - Text - 1 2

Data Flow

As seen in the table, the 8 different communication media vary greatly in their characteristics. By looking at the various data transfer rates, it appears that certain communication media provide significantly more information per time unit than others (in this article classed as media 'richness'). Adding to the mix the limits for senses engaged, which indicate the resources at the communication recipient's availability, an overall conceptual picture starts to form about data flow:

1. There are vastly differing caps for different communication media on how much information is transmittable

2. Dependent on chosen media type, there is disparity in employable reception points (senses engaged) to which information is receivable.

Worth noting about the above quantitative data analysis is that it is solely concerned with mathematics and the numerical aspect of data streams. Left out entirely of this picture are the sociological and design/implementation aspects of communication. Other resource theories/models go in depth with these areas, such as the 34 different hypotheses found in Deutsch's research paper on cooperation and competition[14] and the cost-versus-efficiency model for determining the best group size in Casari and Tagliapietra's article Group Size in Social-ecological Systems[15].

Data Quality

Whereas data flow tells us how much information is mathematically possible to send/receive, data quality relates to the clarity of the transmitted message. This aspect is vital in truly understanding the advantages and pitfalls of various information media. A key measurable for assessing quality is Signal-to-noise ratio.

Looking into the meaning of the numeric transfer rates in the table data, each figure (denoting a pool of information) can be considered to contain two sub-components: signal and noise. The signal is what carries the key message from a communication sender to a communication recipient, whereas the noise covers any other signal that is considered irrelevant to the given conversation/communication transaction. This concept is applicable to both audio and visual media components.

Assuming that both signal and noise account for a low minimum of 10% of the data transfer rate for each medium, the larger data rates immediately transpire to have significantly more resolution in terms of both signal and noise information. Appropriate filtering in terms of blocking out noise would then allow a richer signal to be perceived. Luckily, both our highly-efficient visual and audio perception coupled with advanced brain processing allows just this. For audio, "auditory perception encompasses a sequence of feature extraction steps, with increasingly complex acoustic features extracted at each stage of neural processing"[16]

The bottom-line result of increased available information and our biologically highly effective signal/noise processing is that richer media allow for a much cleaner communication output in terms of delivery of the intended message. Controversially, the more information we have to deal with, the higher the quality of the outcome. Naturally, this is only true as long as there is a reasonable proportion of signal in the data transmission; or, on the flipside, the noise fraction should not exceed certain thresholds. As an example, for face-to-face communication Singleton observes that "for communication to be judged as satisfactory, background levels need to be below about 50 dB(A) for a listener 2 m away..."[17]. Likewise, in terms of the speed of the conversation there are upper limitations defined by our biology. As pointed out by Levitin, "the processing capacity of the conscious mind has been estimated at 120 bits per second"[18].

Historic Media Use

As seen, different communications media have different characteristics. To make best use of the strengths of each medium while steering clear of individual weaknesses, it may be beneficial to keep historic developments and root causes for the creation of different communication media in mind.

While the complete history of communication media spans more than 5000 years, and holds vast amounts of useful knowledge, focusing in on a few key developments may help provide enough resolution to the article topic. Below is a table of date-ordered technological advances and key associated benefits.

Year Medium Introduced Intended Benefit
3200 BC[19] Cuneiform writing Communicate in writing
500 BC[20] Letter Written conversation over distance
1849-1884[21] Telephone (landline) Spoken conversation over distance
1936[22] Video conversation Synchronous video conversation
1971[23] Internet Chat Synchronous written conversation
1971[24] E-mail (electronic mail) Freedom in written conversation over distance
1973[21] Telephone (mobile) Freedom in spoken conversation over distance
1974[25] Audio conferencing Audio conversation over the internet
1984[26] Video conferencing Video conversation over the internet
1992[27] SMS / text message (Short Messaging Service) Quickness of written conversation over distance

From the timing of developments in the data table, a few notable points can be deducted:

  • Human being inter-communication as a concept is very matured
  • Six out of the ten technological developments happened within 21 years, indicating both a strong desire and the technical capability to use multiple communication media.
  • Recognisable common factors exist among the latter; intentions of developing faster, more convenient and richer media outputs

Case Studies

Having studied a selection of commonly used communication media, a look at how project communication in industry affects project success/failure may be interesting. In the following section three case studies are compared and contrasted in terms of their final delivery outcome and the impact in-project communication has had thereupon. The case studies have been selected based on shared project similarities and their varying degree of project communication success, ranging respectively from poor through adequate to good.

Dubai Aquarium

Dubai Aquarium[28], Dubai. The aquarium with acrylic-walled water tunnel is located inside the Dubai Mall; one of the World's largest shopping centres[29].

The aquarium was opened in 2008 with the official title as the World's largest indoor aquarium[30] (tank size: 51 x 20 x 11 metres). It also held the World record for the largest acrylic viewing panel[30].

In February 2010, large parts of the 12.1-million-square-foot Dubai Mall (the biggest shopping complex in the World at the time[31]), which houses the aquarium, had to be evacuated. A leak had developed in the viewing panel facade of the tank, causing water to flood across the floor of the ground level. "As the central part of the Mall was evacuated, the chairman of Emaar, the mall's developer, insisted that there was no leak and that there had been a technical misfunction with the operating device"[32]. However, public photos and video footage from the scene showed water gushing out of the tank.

Emaar later confirmed the leak in a statement, commenting "A leakage was noticed at one of the panel joints of the Dubai Aquarium at the Dubai Mall and was immediately fixed by the aquarium's maintenance team," it said. "The leakage did not impact the aquarium environment or the safety of the aquatic animals"[32].

The communication in this scenario between the project management and the public was evidently full of mixed signals. The initial denial of a leak despite clear visual evidence could be classed as an information disclosure matter arisen from conflict of interest. The subsequent statement tackled the matter at hand very differently; it acknowledged the problem, provided technical insight, gave promises of fast action and problem relief and warranted all key health and safety concerns.

The situation could be classed as a severe crisis: a 10-million litre body of water containing 33,000 aquatic animals at risk, thousands of people present in an enormous shopping centre with the only thing between them being a single acrylic panel that suddenly is at serious risk of breaking effectively threatening thousands of lives.

From the project scenario, four points could be concluded: - Situation: The project met a crisis involving some very high-risk aspects (large water body, critical location, ground-breaking acrylic technology, vast collection of animals) - Communication effected: stakeholder communications were lacking key information, sent contradicting messages and failed to alleviate public concerns when most needed - Action taken: Problem ratification was "swift and appropriate"[33]., and could appear to follow a strategically designed plan - Ultimate project success: The aquarium commissioning project could be considered a success as it continues to operate successfully, is a Dubai landmark attraction and from a business perspective was relatively unharmed by the incident

Sydney Opera House

Sydney Opera House, Australia. The opera house is considered an iconic landmark for both Australia and the World[34].

The Sydney Opera House opened in 1973 at a central setting in Sydney Harbour. While the result of a mere 15 years' work[35], the building represented a leap in construction technology of several decades owing to both its structural design and material engineering.

Rewinding time a little, in 1966 the chief architect Jørn Utzon was forced to resign over questions to his designs aired by the minister of works Davis Hughes[36]. There was a public outcry over the situation, but Utzon was not reinstated and was succeeded by another chief architect, Peter Hall. Hughes informs the public that there is a new architect team on the case, and Utzon tells the new chief architect "I don't think you can do it, I think you're a brave man to try, but I'm not going to be involved anymore"[37].

A few years prior to this, Hughes had started to develop alternative project leadership thoughts. "By August 1965, Hughes had formulated a strategy to take control of the project, devising a plan based on his own convictions and supported by opinions from a range of individuals. Foremost among these was the bureaucratic method favoured by Bill Wood...Bill Wood's report to Hughes resurrected the text book bureaucratic solution of "cheque book control". Intentionally or not, it was designed to get rid of Utzon by stripping him of his authority as project director"[38].

Forwarding time, "in 2007 the Sydney Opera House was formally recognised as one of the most outstanding places on Earth with its inclusion on the UNESCO World Heritage List under the World Heritage Convention"[36].

The communication in this case study example between the respective project heads (minister of works and two chief architects) is very multi-faceted. Listing it as a series of time-ordered events may aid clarification for summarising purposes: 1. Utzon does his job on the project without mentionable communication directed at Hughes 2. Hughes has alternative project plans, and exercises power to execute these 3. Hall contacts Utzon to obtain information prior to accepting the job as new chief architect 4. Utzon ushers Hall by use of some potentially strategically intended use of language

The situation could be considered critical: A construction project worth AUD $102 million[39] at the centre of Worldwide public attention halted jointly by a politically pivotal project leadership decision and, more crucially, a high-risk change of resource-scarce architectural mastermind supervision.

From the project scenario, four points could be concluded: - Situation: The project met a crisis involving management strategy, project planning and internal communication - Communication effected: internal stakeholder communications were partly exchanged and partly omitted, leaving involved parties at various levels of understanding - Action taken: Problem ratification was quick and effective yet messy; the project continued without mentionable losses in time and cost, but serious losses in human integrity - Ultimate project success: The opera house commissioning project could be considered a success, despite misses in targets and various losses along the way

Burj Khalifa

Burj Khalifa[40], United Arab Emirates. The 828-metre high structure holding the title of the World's tallest building for a decade (2010-2020) is literally both a mega project and proof that communication and teamwork is capable of reaching sky-high results.

Burj Khalifa was opened at the heart of Dubai in 2010, stands 828 metres tall and claims the official title as the World's tallest building[40]. At a cost of USD $1.5 billion, constructed by approx. 12,000 labourers[41] and projected to have huge returns-on-investment for Dubai later cemented in popularity rankings [42], the building is the epitome of a mega project[43].

On the day of the opening, at the opening ceremony, the building changed its name. Dubai's ruler, Sheikh Mohammed bin Rashid al-Maktoum, renamed the former Burj Dubai in honour and recognition of the national leader, Sheikh Khalifa bin Zayed bin Sultan al-Nahyan[44]. Beneath the public domain surface, the seemingly sudden name change was rooted in a sizeable financial bail-out of Dubai, including this project, by the UAE ruler as a result of Dubai's weakened economy owing to the global market downturn of 2008-09[45].

"The change caught everyone off guard, from news organisations, including the BBC, which hours later were still using a name that no longer existed; to the Roads and Transport Authority, which suddenly had to rename the tower's newly opened Metro station and replace dozens of road signs. But while many were stunned by the name change, one group was also facing an economic shock: the souvenir sellers...The tower's official store at the observatory on the 124th floor was still selling goods with the old name"[46].

Four years later in 2014, Sheikh Khalifa bin Zayed bin Sultan al-Nahyan returns the gesture when naming Abu Dhabi's tallest building (the Mohammed bin Rashid Tower) after Sheikh Mohammed bin Rashid al-Maktoum.[47]

In 2015, Sheikh Mohammed bin Rashid al-Maktoum shares his overall strategic vision for Dubai (encompassing Burj Khalifa) in a book. He tells: "providing grassroots opportunity and a better quality of life for the people of this region is guaranteed to ameliorate our shared problems of instability and conflict. We have a critical need for long-term projects and initiatives to eliminate poverty, improve education and health, build infrastructure, and create economic opportunities."[48]

The communication throughout this project could be summarised by listing a few key decisions made:

  • Sheikh Mohammed bin Rashid al-Maktoum accepts financial help from the national government to keep the project on track
  • Sheikh Mohammed bin Rashid al-Maktoum times the building name-change for the opening ceremony
  • External companies en masse, alongside some internal building stakeholders, have to make urgent rearrangements in connection with the situation
  • Sheikh Khalifa bin Zayed bin Sultan al-Nahyan decides to commemorate his fellow Emirati through a return gesture of a building dedication
  • Sheikh Mohammed bin Rashid al-Maktoum provides his overall national strategic vision in a book

The situation could be considered contained: A construction project worth USD $1.5bn at risk of failing due to lacking funding, rescued by contingency (borrowed) funding partly paid back through a (highly unexpected and somewhat costly yet ratifiable) public act of gratitude.

From the project scenario, four points can be concluded: - Situation: The project experienced financial difficulties caused by an unforeseen global and local economic crisis - Communication effected: official statements were issued through broadcast and printed media at strategically chosen project stages - Action taken: project stakeholders (particularly financial backers) were dealt with to contain the risky situation - Ultimate project success: The structure commissioning project could be considered a success. Its key deliverable represents a World-celebrated, well-designed piece of engineering which continues to serve daily practical purposes while acting as a top Dubai, UAE and Middle-East tourism landmark.

Case Study Conclusions

The three case study examples showcase different communication approaches based on project parameters and the characteristics of the situation at hand. Summarising their key similarities and differences, the categorised table view below provides a structured overview allowing for comparison and contrasting.

Year Inaugurated Project Name Project Type Official claims/titles/records (key one, if several) Project Communication Verdict (based on case study example) Project Goal / Intended Purpose Realised Project Goal(s)/Purpose(s) Overall Success Rating - 1 to 10 (1=failure, 10=success)
1973 Sydney Opera House Structure UNESCO World Heritage Site[39] Adequate Opera house and national landmark[49] Opera house, national landmark and world signature building 8
2008 Dubai Aquarium Structure World’s largest indoor aquarium Poor Aquarium venue for public benefit[50] Aquarium venue for public benefit 6
2010 Burj Khalifa Structure World’s tallest structure Successful National landmark, World's tallest building National landmark, World signature building, World's tallest building for a decade 9

Collectively, the three examples have raised an array of notable points for the topic of communication, from which a few key trends emerge:

  • The higher the risk, the more important a role communication plays
  • Action speaks louder than words (non-verbal communication through action appeared more important to stakeholders than verbal communication)
  • Transparency, openness and honesty from the project management team's side seemed to yield better results when looking at project outcomes than hidden agendas and unaired/undebated problems

Best Practice

Best practice in communication management and technique encompasses countless resources. Focussing on two of these; the Project Management Institute (PMI) and Prince2, the case studies are compared to the pre-descriptive project management guidelines to investigate if they follow or deviate significantly from these industry widely-acknowledged standards.

PMI summarises the essence of communication management as follows: "Project Communications Management includes the processes necessary to ensure that the information needs of the project and its stakeholders are met through development of artefacts and implementation of activities designed to achieve effective information exchange"[51].

Prince2 takes a slightly more deterministic approach, keeping the final project success at heart: "Effective communication with key stakeholders, both internal and external to the corporate, programme management or customer organization, is essential to the project's success[52].

Both however seem to correspond very closely with the communication management exercised in all three case study examples. Here, the respective project management teams carefully balanced available information, stakeholder relations and communicative efforts according to a more or less formalised communication strategy to incrementally advance towards project success while methodically capturing and safeguarding key opportunities and interests.

On the topic of the project management team's role in communications, PMI states: "Project managers spend most of their time communicating with team members and other project stakeholders...Effective communication builds a bridge between diverse stakeholders who may have different cultural and organizational backgrounds as well as different levels of expertise, perspectives, and interests"[51].

Prince2 places further emphasis on the human resource aspect: "When selecting the senders of information, it is important to select communicators who have the respect and trust of the audience. Their position in the· corporate, programme management or customer organization and expertise in the subject matter will greatly influence their credibility"[52].

Again in all the case studies, the project management teams engaged frequently in communications. However, the credibility of two leadership figures (respectively Hughes in the Sydney Opera House case and the chairman of Emaar in relation to the Dubai Aquarium) was subject to public critique.

Pertaining appropriate use of communication tools and techniques, the standards share generic views. Rather than giving specific tool/method recommendations, they prescribe usage based around communication objectives: - PMI: "Factors that can affect the choice of communication technology include...urgency of the need for information...project environment...sensitivity and confidentiality of the information"[51]. - Prince2: "A communication management approach includes the following: Information needs for each interested party, including:...frequency of communication...means of communication...format of the communication"[52].

Amalgamating the recommendations, the standards advise using the most appropriate communication tools based on the given situation. The case studies practically all conform to this, except for the Sydney Opera House example where Hall contacts Utzon by telephone. That particular (sensitive and confidential) conversation in which Hall is seeking critical advice could have arguably been more informative if held in person. Face-to-face conversation is after all still a highly regarded communications channel; as leadership expert Goman puts it in the context of business, "Technology is a necessary part of business today but incorporating the human touch is what will give businesses the competitive edge"[53].

Summary Points

There is no definitively correct way of exercising project communication. All projects are different and have differing challenges and opportunities. That said, through study and increased knowledge of both people and projects a position of elevated understanding and ability within project communication may be assumed. On a practical level relevant guidelines and principles can help direct decision-making in terms of use of communication tools, design of action plan and stakeholder management.

Through the article the concept of media richness has been discussed, various communication media quantified and their historic characteristics and use explored. It became evident that there are significant differences between various communication media in terms of data transfer capabilities (fidelity). While critical benefits can be achieved by selecting so-called rich media in message perception accuracy terms, care should be taken when using lower-fidelity media to avoid critical information loss.

A selection of real-life industry projects illustrated various implementations of communication strategy and stakeholder management in the project management teams' individual quests to meet their project goals. Where some approaches were effective at handling key messages, people and project tasks others were less successful causing various undesired results. Three universally important learning points that proved successful in different ways in all the case studies were:

  • Exercise clear communication in high-risk situations
  • Action is a stronger communication outlet than words
  • Communicate honestly and openly for the best project results

Looking at industry best practice, two separate sets of project management guidelines confirmed that there is no silver lining in communication management in terms of when to employ what resource to achieve success. Emphasis was placed on project managers spending most of their time engaging with stakeholders, choosing methods of communication on an ad-hoc basis according to situation-based internal and external needs, and always keeping the project milestones and overall goals at the heart of decisions.

In summary, two key points that are vital in project management can be concluded:

1) For maximised understanding (message delivery) choose the richest / highest-fidelity communication medium affordable (time-wise) and available 2) For maximised success (project-specific) communicate clearly, frequently, openly, sometimes through action, but always with the human touch

Annotated Bibliography

Richard L. Daft, Robert H. Lengel (1983). Information Richness: A New Approach to Managerial Behavior and Organization Design.[1] The journal focuses on how organisations design their communication in order to best utilise the strengths of the different media.

Dag Ingvar Jacobsen, Jan Thorsvik (2014). Hvordan Organisationer Fungerer. Copenhagen: Hans Reitzels Forlag.[4] The book contains different perspectives on management and organisation, sub-divided into eleven chapters. The chapter 'Communication in organisations' relates particularly closely to the topic of this article.

Daniel J. Levitin (2014/2015). The Organized Mind: Thinking Straight in the Age of Information Overload.[18] The book is divided into three main parts. Part 1 (chapters 1-2, pages 3-76) explains the science and basic concepts of information and paints a picture of how we in modern times face too much information. Part 2 (chapters 3-7, pages 77-328) gives advice on ways in which we can get more organised. Part 3 (chapters 8-9, pages 329-384), classifies organisation concepts that have not already been covered in part 2 and is focused on giving key practical recommendations for the future.

References

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  2. ↑ Melvin Kranzberg, Michael T. Hannan (1999). History of the organization of work, [Online], p.3 Available at: https://www.britannica.com/topic/history-of-work-organization-648000/Social-classes [First accessed 22 February 2019]
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  15. ↑ Marco Casari, Claudio Tagliapietra (2018). Group Size in Social-ecological Systems (PNAS journal, vol. 115 no. 11). Florida: PNAS, [Online], p.2729 Available at: https://www.pnas.org/content/pnas/115/11/2728.full.pdf [First accessed 27 February 2019]
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