Why evaluate indexing system

According to Lancaster

–How well the system is satisfying its objectives i.e. demands place on

–How efficiently it is satisfying its objectives

–Whether the system justifies its existence

Basic parameters to measure a IRS

Effectiveness: how far it can retrieve the relevant information

•Efficiency: At what minimum cost does the system achieving its objectives

Evaluation Criteria

Quality of indexing system

•Cost

•Response Time

•Cost Effectiveness

•User Effort: accessibility of system, availability of guidance of system personnel, volume of retrieval items

•Form of Presentation