Which API can I use for writing SDL Tridion workflow activities?

Question

I would like to create workflow using SDL Tridion 2011 SP1, and i am going through the documentation in the live content portal.

I have few questions when I go throu

Answer 1

1. Create the workflow diagram (based on the requirement) using visio after installing the visio plugin.
2. upload the workflow into SDL Content Manager by providing the credentials and choosing the relevant publication.
3. For automatted activities: create a c# class library and refer the tridion dll's, and user progid and comvisible = true in the solution.
4. create the necessary functions for your workflow.
5. register the assembly in the SDL Tridion Content Manager server.
6. in the workflow "Edit script" use vb script code to get the C# object and its methods.
7. This will simplify the VBScript code and provide flexibility to the developr to work in c#.