The idea of Learning Objects – “any digital resource that can be reused to support learning” – is emerging as a way to reuse learning materials in different settings and contexts. Standardization efforts have also been conducted, especially related to the establishment of learning object metadata, describing the relevant characteristics that a learning object should present. This work aims at exploring learning objects according to the conceptual, instructional and didactic perspectives, which have been investigated in the context of domain modeling for the development of learning materials. Our goal is to investigate the impact of these perspectives into the set of characteristics specified by the standards for Learning Objects Metadata under development.