The aim of the current literature review is to focus on individuals´ self-concept. The results of the present study reveal that self-concept assumed as an important factor for each and can change his or her belief, attitude, and reaction toward personal and social life. This study likewise explained the beginning of self-concept, different views toward this vital factor, the role of introspection, and multicultural. Furthermore, this paper supported the imperative of self-concept; additionally, it has an essential role in individual advance.

Work engagement is one of the critical factors at an organization, so considering some factors such as leadership styles and organizational support is important. Lack of attention to these factors can lead to undesirable environments for workers. The purpose of this study is to conduct a systematic review based on these variables. Data for this research were gathered from databases of Web of Knowledge, psycarticles, Scopus, psycinfo, Web of Science, and Google Scholar. A total of 165 records were identified in databases. 15 records were discovered in other sources. 149 records remained after deleting duplicates. 117 of these records were examined, 52 registers excluded. 65 complete articles were chosen to be evaluated, and after 10 completed articles had been excluded, 55 studies ultimately remained for inclusion in the synthesis. Overall, leadership styles (transformational leadership and transactional leadership) and organizational support were found as two imperative organizational factors to access better outcomes at the workplace.

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Uncommon events during different decades and centuries create several challenges in the human lifestyle. Truthfully, individuals with any circumstances that have been occurred throughout their life illustrate various reactions and behaviours. In some cases, they report some issues such as Post-Traumatic Stress Disorder (PTSD) that is related to mental health which affected by any type of natural disasters, sickness, close relative dead, war, etc. At present, one of the crucial pandemic disasters caused by worldwide disease and death rates amongst individuals is Coronavirus (Covid-19) that has been spread enormous worries and anxiety in every society and country. The majority of individuals experienced this disaster and some of them demonstrate dissimilar types of anxiety and PTSD. The current literature review attempts to clarify the relation between Coronavirus (COVID-19) and PTSD based on the most recent investigations and reports, then link them to the role of Emotional Intelligence in reducing diverse unusual stress and severe nervousness such as PTSD that is the consequence of Coronavirus (COVID-19).

Background: Nurses’ work engagement is essential both for the quality of the service provided and occupational health. However, there is a lack of adequate information about nurses’ engagement in healthcare organizations that are affected by various factors in the context of Health Psychology.Purpose: This study was aimed at investigating the association between leadership styles of supervisors and work engagement, and elucidating the role of  organizational support in this relationship.Methods: A cross-sectional study was conducted on 85 nurses from the health organizations in Catalonia, Spain, recruited via a snowball procedure. Leadership styles and Three Outcome Scales (TOS) were evaluated through the Multifactorial Leadership Questionnaire (MLQ) as independent variables. POS as an Organizational Support Test assessed a mediating variable (POS), and work engagement as a dependent variable was evaluated by the Utrecht Job Involvement Scale (UWES).Results: The results displayed differences in work engagement depending on job positions. Besides, the results revealed a positive association between leadership styles and TOS with work engagement, other than laissez-faire. Additionally, POS illustrated a positive association with work engagement (r=0.447, p<0.01). Leadership styles except for laissez-faire and TOS positively affect POS; also, TOS significantly predicted work engagement (β=0.581, t(78)=2.196, p<.05). Furthermore, results confirmed that POS mediates the relationship between leadership styles and TOS with work engagement (z=-3.490; z=3.117; z=3.521; z=3.791, p=0.000).Conclusion: Transformational and transactional leadership are two main styles significantly affecting nurses’ engagement with their work, while laissez-faire decreases nurses’ work engagement; therefore, supervisors and leaders of healthcare organizations should consider it. Consequently, nurses with a high POS show superior engagement levels at work. The research sheds new light on health psychology and the clinical area, particularly in nurses’ work engagement.