This paper proposes new approaches to handle online statistical processes on huge and structured data collections in the context of web Censuses and Surveys for National Statistic Institutes (NSI). The recent experience of the first Italian Online Censuses enlightened some criticalities on the use of the standard three-tier web application architecture. Designing effort spent in the creation of web survey modular libraries could be exploited further, in order to expose similar functions among different statistical organizational units and within the whole public administration. In this paper we analyze the advantages entailed by the introduction of a Service Oriented Architecture (SOA) paradigm, intended as a set of principles defining the web interactions among looselycoupled and well-defined business units of work, services. This study is supported by several demos that show the feasibility of the proposed approach in a Statistical environment.