Certification path construction is a complex process and is subject to some degree of trial and error. The certification path construction process has not been standardized, and there is very little published information available to help implementers and product evaluators understand the complexities involved. The purpose of this white paper is to clarify issues associated with the certification path construction process and to make recommendations where appropriate

Understanding_Path_construction-DS2[1].

Ref: http://www.oasis-pki.org/pdfs/Understanding_Path_construction-DS2.pdf