sentences:  This therefore leads to more uniform indexing but this is at the expense of the true meaning being interpreted.A computer program will not understand the meaning of statements and may therefore fail to assign some relevant terms or assign incorrectly.Human indexers focus their attention on certain parts of the document such as the title, abstract, summary and conclusions, as analyzing the full text in depth is costly and time-consuming  An automated system takes away the time limit and allows the entire document to be analyzed, but also has the option to be directed to particular parts of the document.