The document discusses proper service of notices under the Income Tax Act of 1961. It outlines that service must be done according to the methods specified in the Act to be valid. Specifically, it examines several cases where service was deemed improper, such as when notices were served to unauthorized individuals, past the scope of a power of attorney, or without following the specified procedures. The key takeaway is that acquisition of knowledge about a notice alone is not equivalent to proper service; the notice must be served using one of the approved methods in the Act for an assessment to be valid.