Literature synthesis by research domain
| Research domain | Studies (n) | Representative studies | Primary constructs examined | Model contribution |
|---|---|---|---|---|
| Age Discrimination | 15 | North and Fiske (2012, 2015, 2016); Posthuma and Campion (2009) Finkelstein et al. (2015, 2019) Ng and Feldman (2012) | Age stereotypes (competence, adaptability, socio-emotional, resource-based); discrimination experiences; stereotype threat | Witnessed ageism operationalization; four-form ageism taxonomy and categorization processes |
| Bystander Behavior | 7 | O'Reilly and Aquino (2011) Good et al. (2012) Ashburn-Nardo et al. (2008) Moisuc et al. (2018) Chaudoir and Quinn (2010) | Third-party moral reactions; confrontation costs/benefits; intervention likelihood; observer emotions | Witness-centered framework; bystander reinforcement vs. disruption mechanisms |
| Social Identity/Group Processes | 16 | Tajfel and Turner (1979, 1986) Hogg (2007, 2016) Brewer (1999) Bandura (1977, 1986, 1999) Turner et al. (1987) | Social categorization; uncertainty-identity dynamics; ingroup identification; social learning; moral disengagement | Core theory: explains witnessing-categorization link, uncertainty-identity amplification, allegiance despite empathy |
| Organizational Climate/Diversity | 10 | Boehm et al. (2014) Kunze et al. (2011) Salancik and Pfeffer (1978) McKay et al. (2008) Zohar (2000) Robinson and O'Leary-Kelly (1998) | Age diversity climate; social information processing under ambiguity; normative cues; peer influence | Moderating mechanism: normative clarity determines whether witnessing amplifies or disrupts allegiance |
| Intergenerational/Age Diversity | 15 | Burmeister et al. (2018, 2020, 2021) Kunze et al. (2013, 2021) Joshi et al. (2011) Lyons and Kuron (2014) Urick et al. (2017) | Knowledge transfer; intergenerational conflict; team dynamics; communication patterns | Workplace context and practical implications of age-based divisions |
| Research domain | Studies (n) | Representative studies | Primary constructs examined | Model contribution |
|---|---|---|---|---|
| Age Discrimination | 15 | Age stereotypes (competence, adaptability, socio-emotional, resource-based); discrimination experiences; stereotype threat | Witnessed ageism operationalization; four-form ageism taxonomy and categorization processes | |
| Bystander Behavior | 7 | Third-party moral reactions; confrontation costs/benefits; intervention likelihood; observer emotions | Witness-centered framework; bystander reinforcement vs. disruption mechanisms | |
| Social Identity/Group Processes | 16 | Social categorization; uncertainty-identity dynamics; ingroup identification; social learning; moral disengagement | Core theory: explains witnessing-categorization link, uncertainty-identity amplification, allegiance despite empathy | |
| Organizational Climate/Diversity | 10 | Age diversity climate; social information processing under ambiguity; normative cues; peer influence | Moderating mechanism: normative clarity determines whether witnessing amplifies or disrupts allegiance | |
| Intergenerational/Age Diversity | 15 | Knowledge transfer; intergenerational conflict; team dynamics; communication patterns | Workplace context and practical implications of age-based divisions |
Note(s): N = 63 peer-reviewed studies categorized by primary theoretical contribution via iterative author discussion