Engineering homework help. 30561 Chapter 5 Questions 1. Define direct manipulation Describe the benefit and potential problems.2- What are the three principle of direct manipulation?3- What are the guidelines for effective use of icons?4- What are the guidelines for adding 3-D elements to an interface without undermining usability?Chapter 7 Questions 1- describe the characteristics of a well-structured command language.2- What are the guideline for creating usable abbreviation for command set?3- Explain the benefits and limitations of Natural Language Interaction (NLI)

Engineering homework help