In this paper, we discuss how to establish profiles of Systems Engineering standards for companies.In order todefine anappropriate system engineering standard for a company, this paper presents a detailed comparison between the current releases of the main Systems Engineering standards(ANSI/EIA-632, ISO/IEC-15288 and IEEE-1220), and explains how to choose the most adapted one according to the company practices. When no standard completely corresponds, the paper suggests and illustrates how to elaborate a tailor-made standard on the basis of specific required characteristics of the companyor of theproject, followinga multi-standard approach, leading to to extend and adapt a standard by importing some elements from another.