DEVELOP

Pronunciation: di-'vel-ep,dE-.
Function: verb
1. Merriam-Webster.com: to set forth or make clear by degrees or in detail, to work out the possibilities.
2. visionanddesignstudio.com: the stage that takes more than just programming codes that cannot be found in dictionaries, it's also when one looks at how to make a website more useful.

To make a website useful, it needs to have a certain level of interactivity. Whether the site wil be useful, this is the stage that determines it.