**3.1 Signal detection**

Signal detection is the act of searching for and identifying signals, as explained earlier, possible information regarding a drug and a dangerous reaction using event data from any source. It is the method of recognizing the linkage between a drug and an adverse event. It is faster in the collation process when the number of drug users is more in relation to the saying, "the more the merrier." Also, the frequency of the adverse reaction and the rate of reports to the appropriate quarters aids in its detection [3].
