However, some important aspects of job quality, such as workplace relationships, can only be measured through individuals' self-assessment of their own situation; including such indicators necessarily entail some subjective aspects. The OECD framework does not however include purely subjective judgements of “job satisfaction”, as these may be subject to individual preferences, attitudes and values and are not easily amenable to policy. The building blocks of the OECD framework are tailored to specific features of certain countries (including data availability), while retaining the same conceptual foundations14.