Points to get down before start up of Technical Design

Hi Friends,
This post is for the guys who use to work on TD's and sometimes due to stringent time lines miss some points for TD start-up.
Below are some of the points we need to keep in mind for TD start-up.

• Complete Understanding of Functionality of the Use Case
• Security Requirements
• Type of Parameters used for input and output
• Little or basic understanding of the end legacy systems
• Technologies to be used and the decision over that based on its best practices
• Schema files and web services used.
• End System Requirements

Please guide me to add some more points, if I have missed anything.

Thanks,

Ankit Chhabra