Ten commandments of formal methods... ten years later

More than a decade ago, in "Ten Commandments of Formal Methods", we offered practical guidelines for projects that sought to use formal methods. Over the years, the article, which was based on our knowledge of successful industrial projects, has been widely cited and has generated much positive feedback. However, despite this apparent enthusiasm, formal methods use has not greatly increased, and some of the same attitudes about the infeasibility of adopting them persist. How have the formal methods commandments fared over the past decade? Are they still valid in the current industrial setting, and have attitudes toward formal methods improved? The authors revisit their 10 maxims to answer these questions. The commandments are as follows: (i) thou shalt use an appropriate notation, (ii) thou shalt formalize but not overformalize, (iii) thou shalt estimate costs, (iv) thou shalt have a formal methods guru on call, (v) thou shalt not abandon thy traditional development methods, (vi) thou shalt documents sufficiently, (vii) thou shalt not compromise thy quality standards, (viii) thou shalt not be dogmatic, (ix) thou shalt test, test, and test again, (x) thou shalt reuse.