This is the second book based on the 5S (Societies, Scenarios,
Spaces, Structures, Streams) approach to digital libraries (DLs).
Leveraging the first volume, on Theoretical Foundations, we focus
on the key issues of evaluation and integration. These
cross-cutting issues serve as a bridge for those interested in DLs,
connecting the introduction and formal discussion in the first
book, with the coverage of key technologies in the third book, and
of illustrative applications in the fourth book. These two topics
have central importance in the DL field, allowing it to be treated
scientifically as well as practically. In the scholarly world, we
only really understand something if we know how to measure and
evaluate it. In the Internet era of distributed information
systems, we only can be practical at scale if we integrate across
both systems and their associated content. Evaluation of DLs must
take place atmultiple levels,so we can address the different
entities and their associated measures. Thus, for digital objects,
we assess accessibility, pertinence, preservability, relevance,
significance, similarity, and timeliness. Other measures are
specific to higher-level constructs like metadata, collections,
catalogs, repositories, and services.We tie these together through
a case study of the 5SQual tool, which we designed and implemented
to perform an automatic quantitative evaluation of DLs. Thus,
across the Information Life Cycle, we describe metrics and software
useful to assess the quality of DLs, and demonstrate utility with
regard to representative application areas: archaeology and
education. Though integration has been a challenge since the
earliest work on DLs, we provide the first comprehensive 5S-based
formal description of the DL integration problem, cast in the
context of related work. Since archaeology is a fundamentally
distributed enterprise, we describe ETANADL, for integrating Near
Eastern Archeology sites and information. Thus, we show how
5S-based modeling can lead to integrated services and content.
While the first book adopts a minimalist and formal approach to
DLs, and provides a systematic and functional method to design and
implement DL exploring services, here we broaden to practical DLs
with richer metamodels, demonstrating the power of 5S for
integration and evaluation.
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