Abstract
The Open Science movement can be broadly summarised as aiming to promote integrity, repeatability and transparency
across all aspects of research, from data collection to publication. Systematic reviews and systematic maps aim
to provide a reliable synthesis of the evidence on a particular topic, making use of methods that seek to maximise
repeatability and comprehensives whilst minimising subjectivity and bias. The central tenet of repeatability is operationalised
by transparently reporting methodological activities in detail, such that all actions could be replicated and
verified. To date, evidence synthesis has only partially embraced Open Science, typically striving for Open Methodology
and Open Access, and occasionally providing sufficient information to be considered to have Open Data for
some published reviews. Evidence synthesis communities needs to better embrace Open Science not only to balance
knowledge access and increase efficiency, but also to increase reliability, trust and reuse of information collected and
synthesised within a review: concepts fundamental to systematic reviews and maps. All aspects of Open Science
should be embraced: Open Methodology, Open Data, Open Source and Open Access. In doing so, evidence synthesis
can be made more equal, more efficient and more trustworthy. I provide concrete recommendations of how CEE and
others can fully embrace Open Synthesis.