  The current systematic review includes a comprehensive 3-tier strategy
(manual search, backward snowballing, and database search). The accuracy of the
search methodology has been analyzed in terms of extracting related studies and
collecting comprehensive and complete information in a supplementary file. In
the search methodology, qualitative criteria have been defined to select
studies with the highest quality and the most relevant among all search spaces.
Also, some queries have been created using important keywords in the field
under study in order to find studies related to the field of the cloud broker.
Out of 1928 extracted search spaces, 171 search spaces have been selected based
on defined quality criteria. Then, 1298 studies have been extracted from the
selected search spaces and have been selected 496 high-quality papers published
in prestigious journals, conferences, and workshops that the advent of them
have been from 2009 until the end of 2019. In Systematic Mapping Study (SMS), 8
research questions have been designed to achieve goals such as identifying the
most important and hottest topics in the field of cloud broker, identifying
existing trends and issues, identifying active researchers and countries in the
cloud broker field, a variety of commonly used techniques in building cloud
brokers, variety of evaluation methods, the amount of research conducted in
this field by year and place of publication and the identification of the most
important active search spaces.
