This document provides the description of relevant factors for evaluating E-commerce transactions, which can help in identifying indicators, evaluation toolkits and an approach for selection of indicators. This document focuses on E-commerce transaction assurance by providing the relevant factors of evaluations including quality of E-commerce transaction platforms and sites, quality of E-commerce transaction services, local external environments for E-commerce transactions and sustainability of E-commerce transactions. This document also explains the way to set up a set of E-commerce transaction evaluation indicators that enables monitoring and improvement of the quality of E-commerce transactions.