1. Explain how Graphical User Interface (GUI) design techniques may be used in different phases of the System Development Life Cycle (SDLC) 2. It is important that software systems work with clean,...

1. Explain how Graphical User Interface (GUI) design techniques may be used in different phases of the System Development Life Cycle (SDLC)

2. It is important that software systems work with clean, valid data. How can the User Interface be designed to help ensure that data entered by the user is valid?