Is Cyrillic a reformed version of Glagolitic?

Question

Is Cyrillic a reformed version of Glagolitic?

Answer 1

Probably so, with the addition of Greek & Hebrew letters.  

Answer 2

Here's a quote that might interest you:

"At the end of the 9th century, one of these students of Methodius who was settled in Preslav (Bulgaria) created the Cyrillic alphabet, which almost entirely replaced the Glagolitic during the Middle Ages. The Cyrillic alphabet is derived from the Greek alphabet, with (at least 10) letters peculiar to Slavic languages being derived from the Glagolitic."

From what I can gather, Glagolitic was replaced by Early Cyrillic (more information in my sources), which was then adapted to modern standards and pronunciation and transformed into modern Cyrillic.