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IntroductionSources of data, reactivity and controlThe requirements of reliabilityObservation effectsResearcher effectsResearcher characteristics(i) Affiliation of the researcher(ii) Image of the researcher(iii) Distance between researcher and participantsResearcher orientationsParticipant effectsParticipant characteristics(i) Memory decay(ii) Omniscience syndrome(iii) Interview saturationFree download from www.hsrcpress.ac.zaParticipant orientations(i) Role selection(ii) Level of motivation(iii) Response patternsMeasuring instrument effectsContext effectsMore reliable observationTriangulationEnsuring anonymityEstablishing rapportCovert researchControl groupTrainingChoice of fieldworkersReliability of measuring instrumentsConstructive replicationResuméSuggestions for further reading

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