Schema changes can be initiated directly against your database: use SQL Server Data Tools to design your objects (available for both VS2010 & VS2012), or if you prefer, import changes as you go from SSMS.
All ReadyRoll project assets are stored as T-SQL and can be committed to your existing source control system (via a Visual Studio provider plugin, eg. TFS, VisualSVN, Git Extensions etc).
In addition to T-SQL script parsing, ReadyRoll uses gated deployment to validate object dependencies. ReadyRoll projects are based on MSBuild, so automating builds within your favourite Continuous Integration server is a cinch.
ReadyRoll comes with Octopus Deploy support out-of-the-box, enabling consistent database deployments through your lifecycle environments (Test/Staging/Production).
NEW IN VERSION 1.5: Deployment previews
Migrations are first-class citizens of ReadyRoll projects, giving you precise control over how your database is deployed.
Use drift correction to track outside changes and keep your target environments in-sync.
Meet Our Fans
An awesome SQL database change management tool...
This is what VS Database Edition should have been. 
- Paul Stovell (October 2012)
Hands down, ReadyRoll has had the easiest and most complete integration with our development workflow... I'd highly recommend giving this tooling a shot if you're working against SQL Server.
- Nathan Donze (December 2012)
Leave work, get home, clone project, [ReadyRoll] syncs and seeds my db with my branch... I keep on coding and don't miss a beat.
- Rob Sullivan (December 2012)
Seriously impressed with how easy it is to use @ReadyRollSQL for database deployment. #timetoputfeetup
- Colin Byrne (May 2013)