This document provides a summaryassessment of (presented) scaled-up crediting instruments aswell as existing project-based crediting schemes against anumber of important general characteristics of suchinstruments. Its purpose is to provide insights that mayinform the design and use of possible scaled-up creditinginstruments. This summary assessment begins with anexamination of proposals for scaled-up crediting mechanisms.It considers existing crediting instruments, that is, (i)Kyoto project mechanisms (clean development mechanism (CDM)and joint implementation (JI)); and (ii) voluntary emissionreductions (VER) schemes (in the non-compliance andvoluntary markets). The characteristics (or issues) coveredare: (i) national and international circumstances formarket-based mechanisms and how these interact; (ii)coverage and boundary setting; (iii) participation andincentives for participation; (iv) caps, baselines, andallocations (or issuance); (v) market integrity andcredibility; (vi) monitoring, reporting, and verification(MRV); (vii) program authority and administration; and(viii) potential scaling up modalities.