Imagine a situation where, after debating for years on what makes you happy, you finally decide that it is about time you start put these ideas into practice and effectively make yourself happy(ier). If you are really determined, you will be keen to stop convincing yourself that you are happy if you are not: you will want to check whether you are really making progress towards achieving your goals. You will have identified different components of your happiness and will assess some of them, progressing cautiously, step by step. You will also be aware of the links between these components, links that determine your overall state of happiness.\ud In the situation described above, now replace the term 'happiness' by that of 'sustainability' - like concepts such as justice, truth, or happiness indeed, it is a desirable objective, albeit difficult to capture in a concise, shared, definition
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