Communication Adaptation in Investigative Interviewing

Communication adaptation begins with observable needs in the conversation. The interviewer attends to pace, language, detail, turn-taking, organization, social energy, and processing space; considers explanations involving the person, the interviewer, the task, and the conditions; makes the smallest reasonable adjustment; and keeps it only when it improves understanding, participation, rapport, or information quality.

Communication behavior guides process adjustments. It is not used to diagnose personality, predict behavior, or assess credibility or deception. It does use DISC, a communication-style model tracing to William Moulton Marston, as a working style hypothesis to guide rapport, tested by whether the adjustment helps.

The question the direction answers is practical: what does this exchange need right now, and did the change I made actually help?

The interviewer watches the conversation, not the person’s character. The observable signals are visible without any instrument: how fast the person speaks, how much detail they offer, how they take turns, how they organize an account, how much social energy they bring, and how much space they need to process a question before answering.

Observation manages the conversation. Evidence tests the account. ASC teaches interviewers to watch nonverbal and verbal behavior closely, because it tells you how the conversation is going: whether rapport is building or slipping, when a topic is becoming hard to discuss, and when emotion may be getting in the way of a full and accurate account. Early in the interview, the interviewer learns how this person ordinarily communicates (their communication baseline), so later changes stand out. A change is a prompt to check and adjust: slow down, clarify, take a break, rebuild rapport, or return to the topic later. It never tells you whether the person is lying. Deception is identified through inconsistencies with evidence, not body language.

Those observations serve four uses. Each one pairs what the interviewer may notice with a process adjustment, never a conclusion about the person.

These are conditions to check, not conclusions. A person who gives short answers may be guarded, may be tired, may not understand the question, or may simply communicate that way. A person who tells long stories may be building rapport, may be anxious, or may be avoiding a topic. The observation identifies something worth checking. It does not settle what caused it.

Prefer plain description over interpretation: “the person paused and asked for the question again” is more useful, and more fair, than “the person was being evasive.”

Reading style to build rapport. People communicate at different speeds and with different priorities. ASC teaches interviewers to use the DISC model, which traces to William Moulton Marston’s work in the 1920s, as a practical vocabulary for those differences. Early in the interview, the interviewer reads verbal and nonverbal cues along two dimensions: pace (fast and outgoing, or measured and reserved) and focus (on tasks and facts, or on people and relationships). From those cues, the interviewer forms a working guess about the person’s communication style and adjusts:

The style read is a hypothesis, not a finding. The interviewer adjusts, then verifies: did rapport, comprehension, or the flow of information improve? If not, the read is dropped. Style can shift under stress or as topics change, so the read is checked again. A style read is never written into the record as a conclusion about the person, never used to judge truthfulness, and never used to predict behavior, conduct, or fit.

In the four moves, DISC supplies the working hypothesis during Consider, and Verify decides whether it stays. It is one possible explanation held alongside the others (the person, the interviewer, the task, and the conditions), not a replacement for them.

DISC is used here as a practical communication vocabulary, not a validated assessment instrument. Its value in the interview is measured by whether the adjustment improves the conversation.

Communication Adaptation is a process discipline, not an assessment. It does not diagnose personality, type the person, or measure character. It does use DISC as a working style hypothesis to guide rapport, tested by whether the adjustment helps. It does not predict honesty, deception, guilt, memory accuracy, future conduct, job fit, coachability, or how testimony will land at trial. It is not a validated instrument, a behavioral-science model, or a research-validated method.

Culture and context shape communication, so reads are held loosely. What looks like directness in one setting may be ordinary courtesy in another; what looks like reticence may be a deliberate choice. The interviewer treats every observation as a condition to check, not a label to apply, and adjusts the process without deciding what the behavior means about the person.

A boundary worth stating plainly: in the Compass, Communication Adaptation shapes how the interviewer speaks, paces, and frames. It is never used to assess credibility, detect deception, or support an investigative conclusion. No finding in any ASC-trained interview rests on a communication read.