You have been asked to assist the CEO in hiring the most suitable employees for current job openings in (a) sales, (b) employee assistance and peer support, (c) product development (creating new and innovative products), and (d) project management (managing projects to keep them on time and within budget). 

Identify and explain the personality theory you will use, and apply the concepts from this theory to identify the characteristics of an ideal candidate for each of the four jobs.