This paper will summarise the experience of four years activities in the International Standardization Organisation (ISO) working group on child restraint systems in road vehicles. The background for the formation of the working group will be explained. The initial discussion of possible working areas and their priority will be reviewed. It was found that the principal, most urgent areas for investigation of possible future safety standards were compatibility and misuse. Within these areas, the results will be explained in detail, and what possible future Standards or Technical Reports can be foreseen as a result of the work of this ISO working group.