Functional Size Measurement of Electronic Control Units Software Designed Following the AUTOSAR Standard: A Measurement Guideline Based on the COSMIC ISO 19761 Standard

In their early age, E/E (electrical and electronic) systems were OEM (Original Equipment Manufacturers) specific. Adapting existing components to different environments was both time and effort consuming. AUTOSAR (AUTomotive Open System Architecture) is both a consortium founded by the major automotive companies and an architecture standard that allows collaboration on basic E/E functions while providing a platform to develop new innovative ones. One of AUTOSAR main objectives is to standardize a large number of E/E software modules in order to benefit from the reuse of these modules, it also aims to prepare for the increase in functional scope of E/E systems. Functional size measurement (FSM) has become an important task in software development projects for real-time embedded systems. Functional size can be used to estimate development effort, to manage project scope changes, to measure productivity, to benchmark, and to normalize quality and maintenance ratios. Hence, FSM goes hand in hand with AUTOSAR objectives in terms of managing automotive software projects. This paper discusses FSM in connection with AUTOSAR. In particular, it presents a guideline for measuring ECU (Electronic Control Unit) Application Software in the context of AUTOSAR.