Interviewers play a crucial role in the outcome of an interview because their behavior during interview interactions can affect data quality and respondent burden. Existing models of interviewer behavior hypothesize a range of reasons why interviewers deviate from scripted protocols, but these models lack an essential piece of the puzzle: the information driving interviewer decision-making. In this article, we propose a model of the information acquired by the interviewer during the interview process, focusing on the interviewer’s early impressions of the physical interview environment and respondent doorstep behavior (also known as interviewer observations) and the interviewer’s knowledge about the respondent, as gained through the asking and recording of responses to survey questions. To evaluate this model, we used several data and paradata sources from wave 1 of the 2014 Survey of Income and Program Participation (SIPP) Panel, including computer audio-recorded interview (CARI) recordings, interviewer observations, and survey responses collected during the household interview. Consistent with previous research, question characteristics were the most powerful predictors in our models of interviewer behavior. However, we did find limited evidence of interviewers using information they acquired during the interview, including interviewer observations and survey response data, to inform deviations in question asking. Future research and interviewer training implications are discussed.