With increasing adoption of Document Infrastructure across the country, lawyers are getting more and more queries about the use of electronic signatures. The question of validity is a binary question. A particular signing type is either valid or invalid for a particular type of document. This is a primer on how to condense that information into giving useful and actionable legal advice about the use of electronic signatures. Validity is a question of whether a particular electronic signing method can, under law, be used for a particular document. The question of validity is a binary question. A particular signing type is either valid or invalid for a particular type of document.