Home page of Neyer Software, provider of Efficient Sensitivity Test and Analysis Software. Sensitivity tests are required to measure the performance of various systems such as energetic components used in aerospace, automotive air bags, mining, and military systems. Sensitivity tests are also required to test drugs, medicines, and pesticides to determine both their effectiveness and maximum permissible safe level of application. In biological applications they are sometimes referred to as LD50 or LC50 tests, i.e. the level that causes 50% mortality or criticality. Some commonly used sensitivity tests are the Bruceton Test or Up-and-Down Test, the Langlie Test, and the Neyer D-Optimal Test which is often simply called the Neyer Test.