How often are journals added and dropped in WoS?
“The actual journals covered in ISI databases keep changing, almost on a weekly basis, as can be seen from the announcements made in Current Contents and on the ISI website; titles are added and occasionally dropped – not arbitrarily, but on the basis of certain clearly enunciated criteria”. Source: (Arunachalam, S. 2004) Thomson says about 20-30 current journals are added and dropped every month.