Boolean Model
1) Popularly used in most search engines
2) Simple model, where documents are represented as keywords
3) Queries are given as Boolean expressions
4) Result is either 1 or 0, i.e. the term is present or absent respectively.
Advantages:
1)Allows complex queries
2) Result clearly indicates if a documents satisfies the query or not.
Drawbacks:
1) Partial matches are not possible
2) That means, that ranking of documents is not allowed.
3) Since ranking is not possible, if the retrieval system returns too many or too few documents, one cannot control the size of documents returned. ( if one needs the first N relevant documents only)
Ramya
