Internal and external recruitment

When especially might the workers not have the skills required? (Internal Recruitment)

What will the firm already be aware of? (internal recruitment)

Who might external recruitment have a demotivation effect on?

Why? (Following previous question)

What will motivate employees? (Internal recruitment)

Which method results in a wider range of candidates?

A law firm is looking for a name partner. Would internal or external recruitment be the better way of filling that position?