Children struggle with translating their information needs into effective queries to initiate the search process. In this paper, we explore the degree to which the use of a Vocal Assistant (VA) as an intermediary between a child and a search engine can ease query formulation and foster completion of successful searches. We also examine the potential influence VA can have on the search process when compared to a traditional keyboard-driven approach. This comparison motivates the second contribution of our work, an evaluation framework that covers 4 dimensions: (1) a new search strategy (VA) for (2) a specific user group (children) given (3) a particular task (answering questions) in (4) a defined environment (school). The proposed framework can be adopted by the research community to conduct comprehensive assessments of search systems given new interaction methods, user groups, contexts, and tasks.