What's it about?
See also Recruitment Strategies.
Understanding what kind of people you want for the company is the first step. Finding out what a person is really like behind the resume is a skill that requires practicing the use of special questioning techniques.
And of course it's not just a one-way process. An interviewer also needs to sell the company to the candidate. Many good candidates will be put off by being interrogated at the interview stage. An important factor in retaining loyal staff is when a company helps an individual to achieve his or her personal goals.
The most important interviewing techniques are covered and practiced in role play situations.
For example, understanding how to use Open Questions to obtain more background about a candidate. Inexperienced (or untrained) interviewers will commonly use Closed Questions and then wonder how all the candidates seem to give the same response.
A very important philosophy to understand is to based the majority of the questions on Past Performance. It is easy to answer favorably to a question like "Would you be able to do X?" But it is much more revealing to ask: "Please describe a situation in the past where you had to do X".
Other techniques practiced include Negative Balance Questions, Mirror Statements and the use of Silence, Question Layering and Elaborating Questions. These techniques have to be experienced. It is amazing (and often very amusing) how difficult it is to use silence in an interview.
Who benefits the most
Managers who Interview Candidates.
What are the outcomes?
A much more discerning approach to interviewing and selecting candidates. And the ability to gather relevant information about a candidate's suitability for the job and for the company as a whole.
One day. Another half day's follow up would be useful a month later to practice the techniques further and consolidate the new interviewing skills.