The Johns Hopkins University Applied Physiscs Laboratory Participated in three of the five tasks of the CLEF 2001 evaluation, monoligual retrieval, bilingual retrieval, and multilingual retrieval. In this paper we describe the fundamental methods we user and we presnst initial rsults form three experiments. The first investigation examines wheter residual inverse linguistically-motivated probabilistic model. The second experiment attempts to assess the benefit of various translation resources for cross-language retrieval . Our last effort aims to improve cross-collection score normalization, a task essential for the multilingual problem