We work on a web application. We have spend more than two month to simplify every process and workflow. Now, we would like to make the User Interface looking more simplier and clear, working only almost on CSS.
I'm an experienced front-end developer, but I know that simplicity is not an easy stuff to achieve and that when you have simple working features in the back-end it's a different step to make it look simple and clear to the fron-end part and, in our case, to a very specific kind of users.
I mean stuff like round borders for containers and input fields, it seems to be used everywhere today. But I'm afraid to add things, not remove stuff.
The problem is that we got already a lot of stuff and functionalities, now we have to choose what to remove, purify, etc.
Do you have basic rules that gives the user a perception of GUI's simplicity and clarity?