Evaluation Measures easures for a search engine How fast does it index Number of documents/hour (Average document size) How fast does it search Latency as a function of index size Expressiveness of query language ability to express complex information needs Speed on complex queries Uncluttered U Is it free?Evaluation 4 Measures for a search engine ▪ How fast does it index ▪ Number of documents/hour ▪ (Average document size) ▪ How fast does it search ▪ Latency as a function of index size ▪ Expressiveness of query language ▪ Ability to express complex information needs ▪ Speed on complex queries ▪ Uncluttered UI ▪ Is it free? Measures