Introduction

This study focuses on the 20^th and 21^st centuries, given that it is the temporary space where more changes were experienced in the restructuring and organizing of nursing as profession. The last century, due to its proximity, facilitates access to the legacy that can be transmitted by professionals who, in spite of the time transpired, can contribute with their knowledge, perceptions, attitudes, and experiences in different health settings. It is necessary to consider that the different generations of nursing professionals (X generation, Y generation, Baby Boomers, and Veterans) can coexist within the same health staff.¹ Each generation is subject to the development processes of the course of human life; each experiences a unique historical context that shapes the development of said course of life. The diversity of characteristics, like age, gender, socioeconomic level or even ethnicity can cause differences not only within the very work staff but within a generation with respect to the following. Understanding and accepting these differences can contribute to diminishing generational conflict.^2,3 Due to this, it is fundamental to know the generational diversity⁴ and address the specific needs of each of the generations.⁵ The different perspectives provided by multiple generations may be used advantageously to enhance efficiency⁶ and the results of the health staff and promote the resolution of generational conflicts to construct effective work teams.^7,8 Likewise, an environment in which nurses are respected for their differences⁹ is key to generate commitment and promote satisfaction in the workplace. This is why, by fostering relationships, effective communication,^10,11 commitment,^12,13 and compensation¹⁴ among nursing professionals from distinct generations, a cohesive team will be set up that reflects the shared values of all team members.

Through the bibliography search for articles that address generational themes, we set the purpose of appraising and describing knowledge of the generational differences or similarities existing among nursing professionals from the 20^th and 21^st centuries and how these have influenced on the evolution of the profession. These generational differences,¹⁵ within the corresponding social and historical context, are not only known, but are at the service of common goals, thus, become a resource for learning and change. This is the paradigm that gives added value, converting the difference into advantage. In short, it is the paradigm that will be adopted to carry out this work and its justification.

The term generation¹⁶ is used to identify the set of people, within similar age groups, born during the same moment of history and culture.¹⁷⁾ Although there is no absolute beginning or end among the different generations, overall, these encompass 15 - 20 years. The years included in each generation vary among researchers, particularly for those years on the cusp of a generation.¹⁸⁾ A thin line exists between segmenting and stereotyping generations, which is why stereotyping should not be done ^19-21) of the nursing professionals for belonging to a given generation. It must be considered each nursing professionals have their personality and experiences and individual characteristics of life also combine to create unique beings.²²

The term generational cohort ⁽²³ refers to people born during the same overall time lapse who share key vital experiences, including historical events, public heroes, entertainment, hobbies, and early work experiences. It is theorized that these common life experiences create cohesion in perspectives and attitudes. Although knowledge and skills increase as people age, the basic characteristics, including values and behavioral norms established during their formative years persist. As a result, generational cohorts develop values and distinct workforce patterns.

The 20^th and 21^st centuries include the GI generation,²⁴ the Veteran generation, the Baby Boom generation, the X generation, the Y generation, the Z generation (they have not yet joined the health teams) and talk has begun about the Alpha generation, 100% digital.²⁵⁾ This study focuses exclusively on four generations that coincided in the workplace: ⁽²⁶ the Veteran generation, the Baby Boom generation, the X generation, and the Y generation. The following is a brief description of these generations.

The generation of Veterans (also called traditionalists, the Silent or War generation) comprises the nursing professionals born between 1925 and 1945. The Veteran generation has contributed importantly not only to the social, political, and economic transformation in Spain and the rest of the world, but it has been a bulwark within the nursing profession; laying the foundations of the nursing profession as we know it currently. Many of these professionals are already retired. During this period, dramatic events have taken place in the world, like the Great Depression, the Second World War, along with the Civil War in Spain, which led this generation to great sacrifice, like struggling and dying at the service of their respective countries. In turn, this impacted on the way these people saw the world of work. They believe in employment for life and in hierarchies. They also value professional respect, the professional image of nursing, loyalty, and dedication.²⁷ Veterans have worked hard and believe that hard work will produce rewards.²⁸ Changes make them uncomfortable and they tend to favor command, direction control and leadership styles.^29,30 Their principals values are law and order, respect for authority, duty, honor, devotion, and sacrifice.

The Baby Boomer generation encompasses those born between 1946 - 1964; it was called Baby Boom due to due to the increased birth rate observed during this period, they currently constitute two thirds of all nursing professionals. The Baby Boomer generation is the biggest group among nursing professionals. An important number of nurses from the Baby Boomer generation retired in 2010.⁷ They are known for their strong work ethic. They enjoy direct traditional communication, like face-to-face meetings, but have also adapted to les personal modern communication methods that use technology.^31,32) Overall, grew up in a two-parent home with a mother at home, a father who was an authority figure³³ and prefer teamwork.¹⁹ Baby Boomers want the world to know they have achieved something,^34,35 equating work with self-esteem;³⁶ consequently, they can be motivated by public recognition and work advantages. They are pictured as addicted to work and live to work.³⁷

The X generation, born between 1965 and 1980, as they mature, are quickly becoming one of the pillars of the organizations; their strength is ideal to solve problems of the clinical practice or issues related with the guarantee of quality. The X generation is significantly smaller than that of the Baby Boomers. They have been described as the latchkey children of parents with two careers. They are not too loyal to leaders³⁸ and institutions, seeing education as a necessary tool to survive in a competitive world. They are slow to commit and value both their personal and professional lives. They show more indicators of burnout^39,40 and are less inclined to participate in the exchange of knowledge.⁴¹

The Millennials generation, also known as the Y generation, the Net generation, or next generation is composed of nursing professionals born between 1981 and 2000; members of the Y generation and children of the Baby Boomers. By absolute numbers, this generation alone far exceeds the Baby Boom generation, driven in part by an increase in the immigrant population. The Y generation has grown in a multicultural and multiethnic world. Communication through technology is the cornerstone of this generation with mobile phones, text messages, and e-mail. They are experts in technology.⁴² An expanding economy encouraged values, like optimism, trust, honesty, accomplishments,⁴³ career advancement,⁴⁴⁾ la sociability and morality. They are self-sufficient²⁹ and value teamwork,^45,46 as well as tutoring^47-51 and feedback. Just like the Veterans, nursing professionals belonging to the Y generation expect rewards for hard work. The Millennials have an altruistic desire to help,⁵² value the balance between work and life,⁵³ want to make decisions on their work schedules.⁵⁴ One of the most interesting characteristics of the Millennials is their expectation of having the capacity to contribute to decisions in their workplace, provoked by their active role in family decisions.⁵⁵

Methods

The search was conducted in the following databases: CINAHL, PubMed, ProQuest, EbscoHost, Science direct, Scopus, Web of Science, Wiley on-line library, Ovid. In addition, the search was extended to secondary references and to the manual search of journals. The keywords used for the search were: nurses, intergenerational relations, Veterans, Baby Boom, X generation, Millennials.

The selection criteria were descriptive, quantitative, or qualitative studies, and mixed-method studies, which describe the knowledge, perceptions, attitudes, and experiences of the four generations of nursing professionals in different health settings, including students and which additionally contain studies by nursing professionals from the point of view of the four generation cohorts (X generation, Y generation, Baby Boomers, and Veterans). The work included gray literature due to its important source of information that can be corroborated by experts on the field, besides being able to report on useful scientific findings that can reduce publication bias. Other inclusion criteria were peer-reviewed studies, without date-of-publication limit and in English.

The work excluded articles missing any of the four generations of nursing professionals, studies that did address the perspective of any of the four generations or studies whose samples were not constituted by nursing professionals, including students. It also excluded articles that did not describe in detail the knowledge and attitudes of the health professionals in relation with the four generations or that addressed other themes not defined in this study. The study also exclude d presentation formats, like books, text chapters, editorials, and comments or reviews.

To evaluate the quality of the studies included (quantitative and qualitative), a quality verification list was used.⁵⁶ This verification list comprises nine questions, each of which has four subcategories. A total score is calculated of methodological quality, which varies from 9 (quite poor) to 36 (good) and quantitative and qualitative studies can be analyzed, including gray literature. The quality score of the studies included ranges between 33 and 36.

Four research questions were used: what is the current state of the literature with respect to the intergenerational nursing workforce and its influence on the evolution of this profession, what is the current state of the literature with respect to recruiting, retention and tutoring of nurses within an intergenerational workforce and their influence on the evolution of this profession, what is the potential for future research with respect to the nursing profession and its intergenerational work environment, do intergenerational studies exist on nursing professionals in Spain? The updated integrative review methodology described by Whittemore and Knafl⁵⁷ was used as guide for this review. An integrative review is a specific review method that summarizes past empirical or theoretical literature to provide more complete comprehension of a theme or phenomenon besides playing an important role in the evidence-based practice for nursing.⁽⁵⁸

Results

The electronic search process yielded eight articles and two thesis works. Figure 1 summarizes the heuristic and selection process.

Figure 1 Heuristic and document selection process 

The work included 10 articles,^{9,12,13,18,27,29,30,44,49,53}; two from gray literature.^9,53 The articles included in this study all belong to the Anglo-Saxon setting: four from Canada^18,30,44,49, one from Australia²⁹⁾ and five from the United States^{9,12,13,27,53}. No study was found in the Spanish context containing the four generations of nursing professionals. Three themes were determined: intergenerational nursing workforce with seven articles;^{9,12,13,18,27,29,30}recruiting and retaining within an intergenerational workforce with two articles;^44,53tutoring within an intergenerational nursing workforce with one article.⁴⁹ Table 1 summarizes the research studies.

Discussion

Conclusion

Since the late 20^th century and early 21^st century care quality has been deteriorating as a consequence of the shortage⁵⁹ of nursing professionals globally. The shortage of nurses is the product of the combination of an aging workforce, high rotation of nursing staff and the lack of capacity to attract and retain these professionals. Hence, those responsible for health services must know how to promote work commitment in young generations, bearing in mind that different authors have concluded that the X generation and Millennials are the least committed, given that Veteran and Baby Boom nurses have retired or are close to retiring. Only international studies exist that include the four generations of nursing professionals (X, Y, Baby Boomers; Veterans) in the Anglo-Saxon setting, finding none in the Spanish context, which may be proposed for future research. Similarly, future research may be proposed on intergenerational studies from the gender perspective. The findings have the potential to improve generational comprehension and foster a more-cohesive culture in clinical practice settings, besides conserving the legacy of the four generations of nursing professionals, contributing to outline the identity of the nurses through the conservation of social, cultural, and professional experiences.