The halo effect can come into play for lots of reasons: a pleasant personality, a shared work history (i.e., you both worked for the same company in the past) or a shared network of business colleagues. When there is an urgent need to fill the position, other factors can start to come into play: a local candidate versus a potential relocation, or an unemployed candidate who is immediately available versus a candidate who will be giving two weeks’ notice. It requires discipline and a detailed job description to ensure that you are hiring Miss Right rather than Miss Right Now.