Companies across industries are leveraging big-data analytics to enhance their products and services, improve marketing efforts and prevent fraud and abuse of their services. But how do they do this legally and ethically given the challenges of tracking the rights and restrictions that accompany such a vast array of data? With input from in-house compliance professionals and outside counsel, this two-part article series offers practical guidance for designing big-data initiatives that ensure the legal and ethical use of big data across industries. This second installment presents nine areas to consider in achieving compliance, including advice on transparency, security hygiene, resources for guidance, and strategies for dealing with third-party vendors. It also addresses common challenges and the future of big-data analytics. The first part explored what is meant by “big data,” how it is collected and used by various industries and applicable legal requirements. See also “The FTC’s Big Data Report Helps Companies Maximize Benefits While Staying Compliant” (Feb. 3, 2016).