The Synergistic Effects of HR Development Bundles: Investigating the Moderating Role of Mentorship and Performance Feedback on Task and Contextual Performance in Nigerian Deposit Money Banks

The Nigerian Deposit Money Bank (DMB) sector, a cornerstone of the national economy, operates in a dynamic environment that demands a highly skilled and adaptable workforce. While Human Resource Development (HRD) practices are recognized as vital, many banks experience suboptimal returns from investments in isolated initiatives, such as On-the-Job Training (OJT), Mentorship, and Performance Feedback. This study investigates the synergistic effects of bundling these HRD practices to enhance both Task Performance (core job duties) and Contextual Performance (discretionary, extra-role behaviors). Grounded in the Strategic Human Resource Management (SHRM) bundling approach and integrating Human Capital and Social Cognitive Theories, the research proposes that Mentorship and Performance Feedback act as critical moderators that amplify the relationship between On-The-Job-Training and employee performance. A quantitative, cross-sectional survey design was employed, collecting data from 400 employees across various tiers and departments of Nigerian DMBs. Using Structural Equation Modeling (SEM), the study tested a model of direct and moderating effects. The results revealed significant direct effects on OJT and Performance Feedback on performance, but not for Mentorship. Crucially, the analysis confirmed the central hypothesis of synergy: both formal Mentorship and Performance-Based Feedback significantly strengthened the positive relationship between OJT and employee performance. A hierarchical model comparison revealed that the synergistic model, which incorporates interaction effects, explained a considerably greater proportion of variance in performance (R² = 0.58) than the simple additive model (R² = 0.48). The observer concludes that the effectiveness of on-the-job training is not automated; however, it is contingent upon a supportive post-training environment. Mentorship functions as a vital transfer mechanism, while Feedback acts as a calibration mechanism, together catalyzing the application of acquired skills. For theory, this research provides robust empirical support for the contingency perspective of SHRM. For practice, it offers Nigerian DMBs a clear, evidence-based blueprint: to maximize return on HR investments, they must transition from implementing siloed programs to architecting integrated HRD bundles, thereby fostering a resilient and high-performing workforce.