anchor: It is possible, for example, for two persons to interview the same informant and find that one has used a one-sentence summary for a detailed, rich, 5-minute discourse while the other captured much more of the complexity and essence of what was said and what was happening.
positive: It's possible for two people to interview the same person and get two different kinds of results.
negative: Even if multiple people interviewed the same informant, the result would be exactly the same.