indeed a serious problem: the data show that the shortage is substantial and has rapidly increased in the past five years. As a result, both the number of children waiting for placement in a foster familiy and the average waiting time has dramatically increased. Thus, next step would be to identify the possible cause$($s$)$ for this problem. As mentioned, the CEO thinks the problem is caused by the limited financial compensation parents receive, whereas the childcare worker feels that foster parents drop out because they lack training to handle children with severe problems. Finally, the paediatrician suggests that the shortage may be caused by the increase of children being placed into care.