The paper focuses on how paradata information can improve survey methodology and quality. Collecting data via Web allows for server-side paradata (i.e. log files describing access time, number of accesses and so on) and client-side paradata (namely the answering process within the questionnaire, i.e., insight into the sequencing and completeness of responses. Respondent behaviour is traced on each Web page as they answer the survey). If we consider the business surveys, business register data are available, too. This data may be linked to survey data. Therefore, an integrated set of data becomes available and may be used not only for descriptive purposes of substantive information, but for improving the data collection process at different steps of the survey. This paper is analyzing data collected using a web questionnaire in Italy (Innovation survey on Businesses, carried out from Istat) and discusses how survey response, client-side paradata, survey-side parade and auxiliary variables of the business registrer can be allocated in the framework of the survey process.