The amount and severity of security threats have increased considerably over the past two decades, calling into question the validity of assessments administered around the world. These threats have increased for a number of reasons, including the popular use of computerized and online technologies for test administration and the use of almost undetectable technologies for capturing test content and illegally sharing it instantly across borders and cultures. No assessment program, large or small, is immune to this potential damage. The International Test Commission has recognized the critical need for every organization with an important assessment program to be aware of these and be prepared to counter them. It was for this purpose that these guidelines were developed. Knowing the threats and the guidelines will lead to effective measures to protect the program and its assets, maintaining the value of the tests and assessments to the international community. The guidelines listed in this article provide recommendations on planning for better security, maintaining security during the development of tests and while they are administered, and responding well when a security breach occurs. Following these guidelines will create a significant protective barrier between those who willingly commit test fraud and the valuable assets a program has spent time and money to build. [This article was written by the International Test Commission (ITC). ITC formally adopted these guidelines at its July 2014 meeting in San Sebastian, Spain.]