Objectives: The project aims at introducing the knowledge gained by the previous research into the development of a standardized online decision aid (DA) that complements and supports shared decision-making in fertility issues and FP for young cancer patients and their medical caretakers and to evaluate the efficacy of this DA compared with usual care. Primary objective: To show that an online decision-aid tool in addition to standard counselling reduces decisional conflict compared to standard counselling alone. Secondary objectives: 1) to assess whether the decision-aid tool decreases decisional regret significantly, 2) to assess whether the use of the decision-aid tool increases the patients' knowledge on FP and 3) to assess whether patients estimate the decision-aid tool helpful in facilitating the decision-making process.