[1] Many important concepts in information retrieval were developed as part of research on the SMART system, including the vector space model, relevance feedback, and Rocchio classification.
Gerard Salton led the group that developed SMART.
The SMART system also provides a set of corpora, queries and reference rankings, taken from different subjects, notably To the legacy of the SMART system belongs the so-called SMART triple notation, a mnemonic scheme for denoting tf-idf weighting variants in the vector space model.
The following tables establish the SMART notation:[2] The gray letters in the first, fifth, and ninth columns are the scheme used by Salton and Buckley in their 1988 paper.
[4] The bold letters in the second, sixth, and tenth columns are the scheme used in experiments reported thereafter.