Hi Uma. Whether a journal will be considered for SSCI depends mainly on its estimated Impact Factor. I attended a webinar last year where they informed that:

(a) re-evaluations are prioritized for journals that display high citation performance;

(b) they monitor ESCI journals and re-evaluate them when indicators show that the impact criteria may be met;

(c) journals that have the estimated JIF on Q1 or Q2 of the relevant category are prioritized for re-evaluation;

(d) the re-evaluation process starts at the editorial triage stage (the second step of the four-step process). Journals are re-evaluated for quality first; impact evaluation is subject to quality being met.

I imagine that now they will also use the JCI indicator for spotting ESCI journals for SSCI/SCI - specially JCI > 1.0 - above the average of the field.

Thanks Luisa Veras de Sandes-Guimarães for the invaluable information.