Which of the following specifies how to do certification by external parties?

Which of the following was an area of interest for Lillian Gilbreth, an influential contributor?

A. how poor labor coordination caused problems B. how job satisfaction motivated employees C. how bureaucratic positions can foster specialized skills D. how the piece rate system affected productivity

Which of these is not a guideline for display screen design?

A) Create an attractive display screen. B) Facilitate user movement among display screens. C) Keep the display screen simple. D) Vary the display screen presentation.