Productivity is a function of great skills, qualification and education.
The more experienced employees are, the more they create value.
No matter how much employees know or how much they have developed expertise in a corporate culture and practices, that knowledge is of little use if they cannot communicate effectively or work well with other employees.
For individual employees, habits and personality traits can be a source of value. The worker who is disciplined, punctual, meets deadlines, has a positive outlook, and is a team player generates more value than one who may have the same technical skills but lacks these personal traits and habits.