(IUPAC Technical Report) Prepared for publication by

‡Corresponding author Republication or reproduction of this report or its storage and/or dissemination by electronic means is permitted without the need for formal IUPAC permission on condition that an acknowledgment, with full reference to the source, along with use of the copyright symbol ©, the name IUPAC, and the year of publication, are prominently visible. Publication of a translation into another language is subject to the additional condition of prior approval from the relevant IUPAC National Adhering Organization. Information essential for characterizing a flow-based analytical system (IUPAC Technical Report) Abstract: Essential aspects for characterization of a flow-based analytical proce-dure or system are discussed in order to permit the composition of a checklist that will lead to a protocol for reporting results and systems in flow analysis. Aspect