You have seen that acquisition work includes three distinct phases of activities. Document selection is the first phase. There are two aspects in document selection, namely, planning and procedure.
Planning here relates to the various preparations and arrangements you have to make to carry out the procedure efficiently. Book selection is conditioned by three factors: demand, supply and finance. Planning, therefore, must be mainly concerned with these factors. Demand and supply must be known, and finance secured. Further; men and materials required for the work need to be arranged. Echoing similar views, Ranganathan suggest that the distinctive work of Document Selection is to be planned with reference' to the following four factor: Sources, Selection, Indent and Finance. We shall examine below these aspects of planning under four heads, namely