When the status for a manuscript changes "Under Review" to "Ready for Decision", it means that the peer-review process is complete and only the editorial decision is pending. Sometimes, this can take anywhere between 2-6 weeks. It may be that the journal might be waiting to decide based on the theme of the upcoming issue. It may sometimes be that the journals might have an overflow of peer-reviewed manuscripts lined up due to insufficient technical staff, holiday season or based on priority of the manuscript keeping in view the overall aims/scope of the journal. It is best to write to the editor to get an idea about the status of the manuscript.
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