HR Metrics (3-4 pgs with in-text citations (3-4) please): How are employers measuring the effectiveness of their retention strategies?

In addition to actual retention statistics and comparison to similar companies, how are HR leaders determining what interventions (i.e., changes to work environments, management styles, compensation strategies, etc.) are most important to employees?

How are the costs of these changes impacting Bank of America's business practices (i.e., cost to customers, required operational volume, etc.)?

What adaptations are required for more effective (and strategy-based) performance management?

Are these practices sustainable long term? Feel free to use examples from your bank of America and the banking and financial industry to illustrate these points. please be as super detailed as possible and be sure to include intext citations along with references.