Every year, the oil-field services company Schlumberger (NYSE:SLB) polls executives in the oil and gas industry and publishes a human resources benchmark survey. The company has said point-blank that given the high demand for skilled employees in the industry and the complicated extraction techniques, human resources is the main driver of production growth right now.

Today, Fool.com contributors Aimee Duffy and Tyler Crowe talk about keeping track of the efforts that the companies you invest in are making to retain top talent, including boosting salaries and creating employee-focused cultures.