The information requirements for missile guidance are treated from simple parameter descriptions of a missile and a target. Their maximum accelerations and the maneuver response time of the missile characterize the description of the maneuverability of the missile and the target. Other parameters are the lethal range of the warhead, the closing velocity, the time to go etc. The requirements are reflected within the parameters such as the level of uncertainty before and after a measurement, the measuring times or the instantaneous measurement frequency, the total number of measurements
etc. For the most part, the study is not associated with any particular measuring method. The study focus is on the endgame of missile guidance where we apply a simple maneuver model. We suppose that all accelerations are perpendicular to the initial line of sight. A specific case therefore shows a constant closing velocity
and a known time to go. The missile is also characterized by a time delay between the start of the measurement and the effectuation of the acceleration command. The result includes the calculation of the amount of information needed for a certain case and some parameter
dependencies. We have studied the minimum information due to the acceleration ratio between missile and target and also the maximum delay limit due to the acceleration capabilities of the target and missile along with other parameters. The result also indicates the dependence of the information requirement on the time to go.