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Interviews can be unstructured, free-wheeling and open-ended conversations without predetermined plan or prearranged questions. One form of unstructured interview is a focused interview in which the interviewer consciously and consistently guides the conversation so that the interviewee's responses do not stray from the main research topic or idea. Interviews can also be highly structured conversations in which specific questions occur in a specified order. They can follow diverse formats; for example, in a ladder interview, a respondent's answers typically guide subsequent interviews, with the object being to explore a respondent's subconscious motives. Typically the interviewer has some way of recording the information that is gleaned from the interviewee, often by keeping notes with a pencil and paper, or with a video or audio recorder. Interviews usually have a limited duration, with a beginning and an ending.