What are some {optimal/most efficient} approaches for...

What are some {optimal/most efficient} approaches for {carrying out/ executing} talent acquisition ROI analysis, and how can I guarantee the accuracy/reliability of the data I'm utilizing? For instance, how can I incorporate the {secondary/ primary} expenses of recruitment and prevent {typical/implicit} biases in the gathering and examination of data? Furthermore, can you offer some assistance on {evaluating/interpreting} the data to {produce/utilize} valuable insights and suggestions?