A entrevista pode ser dividida em duas modalidades:
a) dirigida, padronizada ou estruturada: é conduzida por um roteiro de perguntas previamente estruturado, utilizando-se de
questionários , como nas pesquisas de mercado;

Na pesquisa que usa metodologia qualitativa (fenomenológica, dialética) geralmente se usam instrumentos 'semi' , ou seja: entrevista semi-estruturada, ...
https://www.listas.unicamp.br/pipermail/ead-l/.../018494.htm...

Entrevista (II)
Níveis de estruturação
Estruturada ou fechada
Relação fixa de perguntas, cuja ordem e redação permanece invariável para todos os entrevistados. Quando se utiliza de respostas previamente estabelecidas, aproxima-se do questionário.
Não-estruturada ou aberta
não é dirigida, o entrevistado fala livremente sobre suas opiniões. Pode ser usada quando se quer explorar a fundo uma experiência específica.
Semi-estruturada
de caráter mais flexível, é realizada a partir de um esquema básico (roteiro), pelo qual é possível realizar as adaptações necessárias.
http://tinyurl.com/nm4plk



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Note added at 17 mins (2009-08-22 14:49:31 GMT)
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Depending on the rest of your document, you might want to say "interview" instead of research.

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Note added at 3 hrs (2009-08-22 17:31:38 GMT)
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A structured interview (also known as a standardised interview or a researcher-administered survey) is a quantitative research method commonly employed in survey research. The aim of this approach is to ensure that each interviewee is presented with exactly the same questions in the same order. This ensures that answers can be reliably aggregated and that comparisons can be made with confidence between sample subgroups or between different survey periods.
Structured interviews are a means of collecting data for a statistical survey. In this case, the data is collected by an interviewer rather than through a self-administered questionnaire. Interviewers read the questions exactly as they appear on the survey questionnaire. The choice of answers to the questions is often fixed (close-ended) in advance, though open-ended questions can also be included within a structured interview.
A structured interview also standardises the order in which questions are asked of survey respondents, so the questions are always answered within the same context. This is important for minimising the impact of context effects, where the answers given to a survey question can depend on the nature of preceding questions. Though context effects can never be avoided, it is often desirable to hold them constant across all respondents.
http://en.wikipedia.org/wiki/Structured_interview

In an unstructured (or non-directed) interview, generally the interviewer begins by asking....
http://tinyurl.com/mwfv5a

Structured interview (447k pages) x directed inverview (20k pages)