Research assessment systems differ between countries

Researchers in universities have to comply with national systems of research assessment and related systems for promotion and tenure. But the strange thing is that research assessment systems differ by country. Which system contributes best to research quality improvement? That seems to me to be the key question, but it is a question which is easy to ask, but difficult to answer. I don’t see any answers in the piece of the TES anyway. What is good is that the piece alerts researchers to the relative value of the national research assessment systems and related promotion and tenure criteria, which, however, are difficult to avoid.

http://www.timeshighereducation.co.uk/story.asp?sectioncode=26&storycode=422639&c=1&goback=%2Egde_2013888_member_219389266