If you are short-listed you will be asked to attend for an interview. Interviews can be a nerve wrecking experience, if you plan properly, you will feel more confident. You are bound to be asked some questions around the area you are applying to and why you would be suitable to work there - so make sure you have done your homework!
Dependent upon the nature of the post, short-listed candidates may be asked to undertake written exercises or a relevant test or prepare and deliver a presentation as part of the interview process.
Should this be the case, you will be informed of the specific requirements in the letter inviting you to attend for interview. Interviews will usually be conducted by at least two people (more often three). At the interview, the panel will ask questions which are intended to allow you to expand on your application and to demonstrate the extent to which you meet the requirements of the post. You will have the opportunity to ask questions.