ISO/IEC 9126 English English English ISO/IEC 9126 English English ISO 9126 software-quality characteristics ISO 9126 non-functional requirements well summarized on Wikipedia well summarized on Wikipedia English English English ISO 9126 English English well summarized on Wikipedia ISO/IEC 9126 ISO/IEC 9126 English non-functional requirements well summarized on Wikipedia well summarized on Wikipedia non-functional requirements ISO/IEC 9126 English English wikipedia English English ISO/IEC 9126 ISO/IEC 9126 wikipedia ISO 9126 English well summarized on Wikipedia non-functional requirements non-functional requirements non-functional requirements non-functional requirements ISO 9126 English well summarized on Wikipedia well summarized on Wikipedia wikipedia wikipedia well summarized on Wikipedia well summarized on Wikipedia ISO/IEC 9126 non-functional requirements English wikipedia https://en.wikipedia.org/wiki/ISO/IEC_9126 for example ISO 9126 English wikipedia English English English wikipedia English ISO/IEC 9126 well summarized on Wikipedia ISO/IEC 9126 non-functional requirements ISO/IEC 9126