Inputs, Outputs, and Stakeholders

Stakeholders in Systems Engineering

Stakeholders in systems engineering refer to individuals, groups, organizations, or entities that have a vested interest or stake in the development, implementation, operation, or outcomes of a system being engineered. Stakeholders play various roles throughout the systems engineering lifecycle and have different perspectives, needs, priorities, and concerns that must be considered and addressed to ensure the success of the project. Here are some common stakeholders in systems engineering:

  1. Customers: Customers are stakeholders who commission or procure the system being engineered. They have specific requirements, expectations, and objectives for the system and play a central role in defining its scope, functionality, performance criteria, and acceptance criteria. Customers may include internal or external clients, end-users, sponsors, or funding agencies.

  2. Users: Users are stakeholders who interact directly with the system being engineered to perform tasks, achieve goals, or derive benefits. They provide input on usability, user experience, workflow efficiency, and functionality requirements, helping to ensure that the system meets their needs, preferences, and usability standards. Users may include operators, administrators, maintenance personnel, or other end-users who interface with the system on a regular basis.

  3. Subject Matter Experts (SMEs): Subject matter experts are stakeholders who possess specialized knowledge, expertise, or domain-specific insights relevant to the system being engineered. They provide technical guidance, domain knowledge, best practices, and industry standards to inform system design, architecture, requirements analysis, and validation efforts. SMEs may come from various disciplines, including engineering, science, technology, operations, and regulatory compliance.

  4. Project Managers: Project managers are stakeholders responsible for planning, organizing, and executing systems engineering projects to achieve defined objectives, deliverables, and milestones within scope, schedule, and budget constraints. They coordinate multidisciplinary teams, allocate resources, manage risks, and communicate with stakeholders to ensure project success. Project managers may also oversee procurement, contracting, and vendor management activities related to the project.

  5. Developers and Engineers: Developers and engineers are stakeholders responsible for designing, implementing, integrating, and testing the components, subsystems, and interfaces of the system being engineered. They translate system requirements into technical specifications, develop design artifacts, write code, conduct unit testing, and collaborate with other team members to ensure that the system meets performance, quality, and reliability standards.

  6. Regulatory Agencies: Regulatory agencies are stakeholders responsible for establishing and enforcing regulations, standards, and guidelines governing the design, development, deployment, and operation of systems within specific industries or sectors. They review and approve compliance documentation, certification reports, and safety assessments to ensure that systems meet regulatory requirements and industry standards for safety, reliability, and quality.

  7. Investors and Shareholders: Investors and shareholders are stakeholders who provide financial resources, funding, or capital investment to support systems engineering projects. They have a financial interest in the success and profitability of the project and may influence strategic decisions, resource allocation, and project priorities based on their investment objectives and return on investment expectations.

  8. Suppliers and Vendors: Suppliers and vendors are stakeholders who provide goods, services, components, subsystems, or technology solutions that contribute to the development, implementation, or operation of the system being engineered. They collaborate with project teams, fulfill procurement requirements, and deliver products or services according to specifications, schedules, and quality standards.

  9. Community and Public Interest Groups: Community and public interest groups are stakeholders who represent the interests, concerns, and values of broader communities, populations, or constituencies affected by the system being engineered. They advocate for transparency, accountability, equity, and sustainability in system design, deployment, and operation, and may engage in public outreach, education, and advocacy efforts to promote public awareness and involvement in decision-making processes.

  10. Ethical Review Boards: Ethical review boards are stakeholders responsible for evaluating the ethical implications, risks, and consequences of systems engineering projects, particularly those involving human subjects, sensitive data, or emerging technologies with potential societal impacts. They review research protocols, consent forms, privacy safeguards, and risk mitigation strategies to ensure that systems engineering activities adhere to ethical principles, legal requirements, and professional standards of conduct.

Overall, stakeholders in systems engineering encompass a wide range of individuals, groups, organizations, and entities with diverse interests, perspectives, and roles in shaping the design, development, deployment, and operation of systems. Effective stakeholder engagement, communication, and collaboration are essential for fostering alignment, building consensus, and achieving success in systems engineering projects.

Who are the stakeholders of your system?

When the system of interest is the systems engineer himself or herself, the stakeholders involved may vary depending on the context and specific objectives of the systems engineering program. Here are some possible stakeholders in this scenario:

  1. The Systems Engineer: The systems engineer themselves is a primary stakeholder in the program. They have a vested interest in the success of the project, as it directly impacts their professional development, career advancement, personal well-being, and overall effectiveness as a systems engineer.

  2. Supervisors and Managers: Supervisors, managers, or organizational leaders who oversee the systems engineer’s work may also be stakeholders in the program. They have a vested interest in the engineer’s performance, productivity, and professional growth, as it reflects on the success of the organization and its projects.

  3. Colleagues and Team Members: Colleagues, team members, or collaborators who work with the systems engineer on projects may be stakeholders in the program. They rely on the engineer’s contributions, expertise, and collaboration to achieve shared goals and objectives, and they may be affected by the outcomes of the program.

  4. Clients or Customers: If the systems engineer’s work directly serves external clients or customers, they may also be stakeholders in the program. They have specific requirements, expectations, and preferences for the systems engineering solutions delivered by the engineer, and their satisfaction is crucial for project success and continued business relationships.

  5. Peers and Professional Networks: Peers, mentors, or members of professional networks within the systems engineering community may serve as stakeholders in the program. They provide feedback, support, and resources to the engineer, helping them stay informed, connected, and engaged in their field of expertise.

  6. Regulatory Bodies or Certification Boards: Regulatory bodies, certification boards, or professional associations that govern standards and practices in systems engineering may also be stakeholders in the program. They establish criteria, guidelines, and requirements for professional certification, licensure, or accreditation, which may impact the engineer’s career and professional standing.

  7. Educational Institutions: If the systems engineer is enrolled in educational programs or continuing education courses, educational institutions may also be stakeholders in the program. They provide training, resources, and support to the engineer, helping them acquire new skills, knowledge, and credentials to advance their career and expertise.

  8. Personal and Professional Networks: Personal and professional networks, including friends, family members, mentors, and industry contacts, may also be stakeholders in the program. They provide emotional support, advice, and encouragement to the engineer, helping them navigate challenges, seize opportunities, and achieve their goals.

Overall, stakeholders in a systems engineering program where the system of interest is the systems engineer themselves may include a diverse range of individuals and organizations with a vested interest in the engineer’s professional development, career success, and personal well-being. Effective stakeholder engagement and management are essential for ensuring alignment, collaboration, and support throughout the program lifecycle.

What do you put into your system?

When considering the human as a complex system, inputs can be understood as various factors, influences, and stimuli that affect the functioning, behavior, and development of the individual. Inputs can come from internal and external sources and play a crucial role in shaping the dynamics of the human system. Here are some examples of inputs in the context of the human system:

  1. Sensory Inputs: Sensory inputs refer to information received through the five senses: sight, hearing, touch, taste, and smell. These inputs include stimuli from the external environment, such as light, sound, temperature, texture, flavors, and odors. Sensory inputs provide the brain with information about the surrounding world and contribute to perception, cognition, and decision-making.

  2. Nutritional Inputs: Nutritional inputs consist of the food and fluids consumed by an individual, providing essential nutrients, energy, and hydration needed for growth, metabolism, and cellular function. Nutritional inputs influence various aspects of health and well-being, including physical growth, organ function, immune system strength, and cognitive performance.

  3. Environmental Inputs: Environmental inputs encompass the physical, social, cultural, and economic conditions in which an individual lives, works, and interacts. These inputs include factors such as air quality, water quality, housing conditions, community resources, socioeconomic status, social support networks, and cultural norms. Environmental inputs can influence health outcomes, behavior patterns, and quality of life.

  4. Genetic Inputs: Genetic inputs refer to the genetic information inherited from biological parents, which influences the individual’s physical traits, susceptibility to diseases, metabolism, and other biological characteristics. Genetic inputs interact with environmental factors to shape phenotypic expression and individual variation in health and behavior.

  5. Social Inputs: Social inputs encompass interactions, relationships, and social dynamics that individuals experience within families, peer groups, communities, organizations, and society at large. These inputs include social support, social networks, social norms, peer pressure, role expectations, and interpersonal communication. Social inputs influence psychological well-being, behavior, identity formation, and social integration.

  6. Cognitive Inputs: Cognitive inputs consist of information, knowledge, beliefs, attitudes, and mental models acquired through learning, education, and personal experiences. These inputs shape perception, cognition, decision-making, problem-solving, and emotional regulation. Cognitive inputs contribute to the development of skills, competencies, and adaptive behaviors that facilitate adaptation and resilience.

  7. Emotional Inputs: Emotional inputs encompass feelings, emotions, moods, and affective states experienced by an individual in response to internal and external stimuli. These inputs include both positive and negative emotions, such as joy, sadness, fear, anger, love, and gratitude. Emotional inputs influence motivation, behavior, interpersonal relationships, and overall subjective well-being.

  8. Physiological Inputs: Physiological inputs refer to internal signals and processes within the body that regulate biological functions, homeostasis, and overall health. These inputs include hormonal signals, neural impulses, biochemical reactions, and physiological responses to stress, exercise, and environmental stimuli. Physiological inputs influence metabolism, energy balance, immune function, and stress resilience.

Overall, inputs in the human system are diverse and multifaceted, encompassing sensory, nutritional, environmental, genetic, social, cognitive, emotional, and physiological factors that interact dynamically to shape individual functioning, behavior, and development. Understanding the interplay between these inputs is essential for comprehensively addressing human health, well-being, and resilience across the lifespan.

What are your Outputs?

When considering the human as a complex system, outputs can refer to various aspects of behavior, function, or outcomes that result from the interactions and processes within the system. These outputs encompass a wide range of phenomena across different levels of organization, from individual physiological processes to interpersonal relationships to societal dynamics. Here are some examples of outputs in the context of the human as a complex system:

  1. Physiological Outputs: These include observable outcomes related to bodily functions, processes, and responses. Examples include heart rate, blood pressure, hormone levels, immune response, neural activity, respiratory rate, and metabolic processes. These physiological outputs reflect the functioning of various organ systems and regulatory mechanisms within the body.

  2. Behavioral Outputs: These encompass observable actions, responses, or patterns of activity exhibited by individuals. Examples include movements, gestures, facial expressions, speech, decision-making, problem-solving, social interactions, and coping strategies. Behavioral outputs reflect the integration of cognitive, emotional, and motivational processes in guiding actions and responses to internal and external stimuli.

  3. Psychological Outputs: These pertain to internal states, experiences, or processes related to cognition, emotion, perception, and motivation. Examples include thoughts, beliefs, attitudes, emotions, memories, perceptions, motivations, desires, and subjective experiences. Psychological outputs reflect the cognitive, affective, and motivational dimensions of human functioning and subjective well-being.

  4. Social Outputs: These involve interactions, relationships, or dynamics occurring within social groups or networks. Examples include communication patterns, social roles, group cohesion, cooperation, conflict resolution, leadership dynamics, cultural norms, and societal institutions. Social outputs reflect the complex interplay of individual behaviors, beliefs, and values within broader social contexts.

  5. Environmental Outputs: These encompass interactions, impacts, or changes occurring within the external environment as a result of human activities. Examples include ecological footprint, resource consumption, pollution levels, habitat alteration, climate change, urbanization, and land use patterns. Environmental outputs reflect the ecological, economic, and societal consequences of human behavior and decision-making.

  6. Health and Well-being Outputs: These encompass indicators of physical health, mental health, and overall quality of life. Examples include disease prevalence, mortality rates, disability-adjusted life years, mental health outcomes, subjective well-being, life satisfaction, and resilience. Health and well-being outputs reflect the complex interactions between biological, psychological, social, and environmental factors in shaping individuals’ health status and quality of life.

In summary, outputs in the context of the human as a complex system encompass a diverse array of phenomena, including physiological processes, behaviors, psychological experiences, social interactions, environmental impacts, and health outcomes. Understanding and analyzing these outputs can provide insights into the dynamics, functioning, and resilience of the human system across multiple levels of organization and interaction.

How much do inputs matter?

When considering the human as a complex system, it’s essential to recognize the profound impact of the multitude of inputs that individuals encounter throughout their lives. These inputs, which can be both internal and external, shape and influence virtually every aspect of human functioning, behavior, and development. Here’s how the human system is greatly impacted by the diverse array of inputs it receives:

  1. Biological Inputs: Biological inputs encompass genetic factors, physiological processes, and neurochemical signals within the body. Genetic inputs determine inherited traits, predispositions to certain diseases, and individual variations in metabolism, hormone levels, and neurotransmitter activity. Physiological inputs, such as nutrition, sleep, exercise, and stress, directly affect bodily functions, energy levels, immune response, and overall health.

  2. Environmental Inputs: Environmental inputs include physical, social, cultural, and economic factors in the external environment that individuals encounter on a daily basis. These inputs encompass aspects such as air quality, water quality, temperature, noise levels, natural disasters, urbanization, social support networks, socioeconomic status, cultural norms, and economic opportunities. Environmental inputs can impact physical health, mental well-being, social relationships, and lifestyle choices.

  3. Sensory Inputs: Sensory inputs refer to information received through the five senses: sight, hearing, touch, taste, and smell. These inputs provide individuals with information about the external world, enabling perception, cognition, and decision-making. Sensory inputs influence how individuals perceive and interpret their surroundings, interact with objects and people, and make sense of their experiences.

  4. Social Inputs: Social inputs encompass interactions, relationships, and social dynamics within families, peer groups, communities, organizations, and society at large. These inputs include social norms, values, beliefs, role expectations, communication patterns, and interpersonal relationships. Social inputs shape identity formation, self-concept, socialization, emotional regulation, and behavior patterns.

  5. Cognitive Inputs: Cognitive inputs consist of information, knowledge, beliefs, attitudes, and mental models acquired through learning, education, and personal experiences. These inputs influence cognitive processes such as perception, attention, memory, reasoning, problem-solving, and decision-making. Cognitive inputs shape individuals’ understanding of themselves, others, and the world around them, guiding their beliefs, attitudes, and behaviors.

  6. Emotional Inputs: Emotional inputs encompass feelings, emotions, moods, and affective states experienced by individuals in response to internal and external stimuli. These inputs include both positive and negative emotions, such as joy, sadness, fear, anger, love, and gratitude. Emotional inputs influence motivation, behavior, social interactions, and overall subjective well-being.

  7. Cultural Inputs: Cultural inputs refer to the values, norms, beliefs, symbols, traditions, and practices shared by members of a particular cultural group or community. These inputs shape individuals’ worldview, identity, social roles, communication styles, and behavioral expectations. Cultural inputs influence socialization, identity formation, self-expression, and intercultural interactions.

  8. Educational Inputs: Educational inputs consist of formal and informal learning experiences that individuals engage in throughout their lives, including schooling, training, professional development, and lifelong learning activities. These inputs provide individuals with knowledge, skills, competencies, and perspectives that contribute to personal growth, career advancement, and intellectual enrichment.

Overall, the human system is greatly impacted by the diverse multitude of inputs it receives, which shape and influence individuals’ physical health, mental well-being, social relationships, cognitive functioning, emotional regulation, cultural identity, and overall quality of life. Understanding the interplay between these inputs is essential for comprehensively addressing human development, behavior, and functioning across the lifespan.

What difference do your outputs make?

The outputs of an individual, which encompass their actions, behaviors, decisions, and interactions with the world around them, have a significant impact on those closest to them and on the stakeholders involved in their lives. These outputs shape relationships, influence outcomes, and contribute to the broader social and cultural context in which individuals live. Here’s how the outputs of an individual affect those around them:

  1. Family and Relationships: The outputs of an individual can profoundly affect their family members and close relationships. Positive outputs such as love, empathy, support, and collaboration strengthen bonds and foster a sense of trust, intimacy, and connection within relationships. Negative outputs such as conflict, criticism, neglect, or abuse can strain relationships, erode trust, and lead to emotional distress and interpersonal conflict.

  2. Social Networks: The outputs of an individual also impact their broader social networks, including friends, colleagues, neighbors, and community members. Positive outputs such as kindness, generosity, cooperation, and altruism contribute to positive social interactions, mutual support, and community cohesion. Negative outputs such as aggression, hostility, deception, or withdrawal can disrupt social harmony, undermine trust, and lead to social isolation or ostracism.

  3. Work and Professional Relationships: The outputs of an individual in the workplace affect their colleagues, supervisors, clients, and stakeholders. Positive outputs such as professionalism, teamwork, integrity, and competence enhance productivity, morale, and job satisfaction. Negative outputs such as conflict, incompetence, dishonesty, or misconduct can disrupt workflow, damage relationships, and impact organizational culture and reputation.

  4. Health and Well-being: The outputs of an individual can have implications for their own health and well-being, as well as for the health and well-being of those around them. Positive outputs such as self-care, healthy lifestyle choices, and stress management contribute to overall well-being and resilience. Negative outputs such as substance abuse, risky behaviors, or poor coping strategies can lead to physical health problems, mental health disorders, and interpersonal conflicts.

  5. Community and Society: The outputs of an individual also have broader implications for the community and society at large. Positive outputs such as civic engagement, volunteerism, environmental stewardship, and social activism contribute to social progress, collective well-being, and sustainable development. Negative outputs such as crime, corruption, discrimination, or exploitation can undermine social cohesion, trust in institutions, and societal stability.

  6. Stakeholders and Interested Parties: The outputs of an individual affect stakeholders and interested parties who have a vested interest in the individual’s well-being, success, or behavior. These stakeholders may include family members, friends, employers, colleagues, clients, customers, community members, regulatory agencies, and public interest groups. Positive outputs may garner support, trust, and goodwill from stakeholders, while negative outputs may lead to concerns, conflicts, or repercussions.

Overall, the outputs of an individual reverberate through their relationships, communities, and broader social systems, shaping experiences, influencing outcomes, and contributing to the collective fabric of society. Understanding the impact of one’s outputs on others and on the broader context in which they operate is essential for fostering positive relationships, promoting social responsibility, and creating a more compassionate and resilient community.

And how those effects spread... and spread...

The outputs that a person puts out not only impact their immediate surroundings and those closest to them but can also create a ripple effect that extends far beyond their immediate sphere of influence, ultimately influencing broader social dynamics, cultural norms, and global issues. Here’s how this ripple effect occurs:

  1. Immediate Surroundings: The outputs of a person directly affect their immediate surroundings, including their family, friends, colleagues, and community. Positive outputs such as kindness, generosity, and cooperation can inspire others to reciprocate these behaviors, creating a positive atmosphere and fostering a sense of connection and support within the community. Conversely, negative outputs such as conflict, hostility, or indifference can create tension, mistrust, and division, leading to negative outcomes within the immediate social environment.

  2. Interpersonal Relationships: The outputs of individuals within their immediate social circles can influence the behaviors and attitudes of those around them. Positive interactions between individuals can lead to positive outcomes, such as strengthened relationships, increased trust, and enhanced well-being. These positive interactions can then ripple outwards as individuals carry forward the positive energy and attitudes they have experienced into their interactions with others, creating a ripple effect of positivity and cooperation.

  3. Social Networks: The outputs of individuals within their social networks can spread through social connections and relationships, influencing a wider circle of people. Positive outputs such as acts of kindness, support, and collaboration can inspire others to engage in similar behaviors, leading to a cascade of positive interactions and outcomes within the broader social network. Conversely, negative outputs such as conflict, gossip, or exclusion can spread negativity and discord, leading to social fragmentation and mistrust.

  4. Cultural Norms and Values: The outputs of individuals contribute to the shaping of cultural norms, values, and collective attitudes within society. Positive outputs that promote empathy, tolerance, and social justice can contribute to the cultivation of a culture of compassion and cooperation. As more individuals adopt these positive values and behaviors, they can influence broader societal attitudes and norms, leading to positive social change. Conversely, negative outputs that perpetuate prejudice, discrimination, or injustice can reinforce negative cultural patterns and hinder progress towards social equality and harmony.

  5. Global Impact: The outputs of individuals can also have a global impact, contributing to larger-scale social, economic, and environmental challenges and opportunities. Positive outputs such as advocacy for human rights, environmental conservation, and international cooperation can contribute to global efforts to address pressing issues such as poverty, climate change, and conflict resolution. Conversely, negative outputs such as exploitation, corruption, or environmental degradation can exacerbate global challenges and undermine efforts towards sustainable development and peace.

In summary, the outputs that individuals put out have a ripple effect that extends from their immediate surroundings to broader social networks, cultural norms, and global issues. By fostering positive outputs such as kindness, empathy, and cooperation, individuals can contribute to the creation of a more compassionate, just, and sustainable world, where the ripple effect of positive actions creates waves of positive change that reach far and wide.

And come back to you some day.

The way a person affects others often has a reciprocal effect, meaning that their actions, behaviors, and interactions with others can ultimately come back around to impact them in various ways. This concept is often referred to as the “law of reciprocity” or “karma” in different cultural and philosophical contexts. Here’s how this reciprocal effect plays out:

  1. Impact on Relationships: The way a person treats others tends to shape the quality of their relationships. If someone consistently demonstrates kindness, empathy, and respect towards others, they are more likely to receive similar treatment in return. Conversely, if someone engages in behaviors that are harmful, disrespectful, or dishonest, they may experience strained or damaged relationships as a result. Positive interactions tend to foster trust, goodwill, and reciprocity, while negative interactions can lead to resentment, conflict, and alienation.

  2. Social Reputation: The way a person behaves and interacts with others influences their social reputation and how they are perceived by others. Positive behaviors such as honesty, integrity, and generosity enhance one’s reputation and can lead to opportunities for collaboration, support, and advancement. Conversely, negative behaviors such as dishonesty, selfishness, or aggression can tarnish one’s reputation and may result in social consequences such as mistrust, exclusion, or reputational damage.

  3. Emotional Well-being: The way a person affects others can also impact their own emotional well-being. Engaging in acts of kindness, compassion, and altruism towards others can enhance feelings of happiness, fulfillment, and connectedness. Conversely, engaging in behaviors that harm or upset others can lead to feelings of guilt, shame, or regret, which can negatively affect one’s mental and emotional state. Additionally, experiencing reciprocity in the form of kindness and support from others can contribute to a sense of belonging and social support, which are important for overall well-being.

  4. Opportunities and Consequences: The way a person interacts with others can influence the opportunities and consequences they encounter in various aspects of life. Positive interactions may open doors to new opportunities, collaborations, and experiences, while negative interactions may lead to missed opportunities, setbacks, or conflicts. Reciprocal effects can manifest in various domains, including personal relationships, professional endeavors, and community involvement.

  5. Long-term Outcomes: Over time, the cumulative effects of one’s interactions with others can shape their long-term outcomes and trajectory in life. Positive, reciprocal interactions tend to foster positive outcomes such as personal growth, success, and fulfillment. Conversely, negative interactions may lead to negative outcomes such as isolation, stagnation, or adversity. The way a person affects others can create a ripple effect that reverberates throughout their life, influencing their experiences, relationships, and overall well-being.

In summary, the way a person affects others often has a reciprocal effect, influencing their relationships, reputation, emotional well-being, opportunities, and long-term outcomes. By fostering positive interactions and behaviors, individuals can cultivate a supportive social network, enhance their reputation, and contribute to their own well-being and success.

Research proves it

The concept of reciprocal treatment and its outcomes, often linked to the idea of karma in popular discourse, finds empirical support in various domains of psychological and social research. Here are some insights from relevant studies:

  1. Reciprocal Inhibition in Psychotherapy: Techniques based on reciprocal inhibition, such as systematic desensitization, aim at replacing undesirable responses with non-anxiety-producing responses in the presence of a stimulus, indicating a form of reciprocal effect in therapeutic settings (Wolpe, 1958).

  2. Reciprocal Determinism: Social learning theory conceptualizes behavior in terms of reciprocal determinism, where psychological functioning involves a continuous reciprocal interaction between behavioral, cognitive, and environmental influences. This suggests that the way individuals treat others can influence how they are treated in return, through a complex interplay of factors (Bandura, 1978).

  3. Reciprocal Behavior in Economic Games: Studies on reciprocal behavior in economic games have shown that positive reciprocity is influenced by the level of social distance but not the level of monetary payoff, indicating that reciprocal treatment in human interactions can vary based on social context and is not solely driven by material benefits (Cox & Deck, 2005).

  4. Reciprocal Emotion Management: The concept of reciprocal emotion management in the workplace illustrates how reciprocal efforts to manage each other’s emotions among similar others can contribute to maintaining status inequality, indicating that reciprocal interactions can have complex social implications (Lively, 2000).

  5. Reciprocal Altruism: The evolution of reciprocal altruism explains how altruistic behavior, where benefits to the recipient exceed the cost to the altruist, can be selected for in a way that cheaters (non-reciprocators) are penalized, supporting the idea that reciprocal treatment has deep evolutionary roots and societal benefits (Trivers, 1971).

These studies collectively support the notion that reciprocal treatment—how one treats others and how one is treated in return—is a significant factor in various aspects of human behavior and social interactions, from psychological therapy and social learning to economic decisions and emotional management in professional settings.

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