Most Early Childhood Development (ECD) assessment tools start by filling a questionnaire designed by ECD experts. Call this the "external expert driven" approach: an external expert --- the questionnaire designer --- is assumed to know best what and how to measure ECD.
Baby CROINC (CROwd INteractive Clustering) takes a different, citizen science oriented, approach which is based on these assumptions:
1) Each parent is an expert on the ECD of her/his child(ren)
2) ECD is too complex to be captured by any single questionnaire
3) Algorithms can help parent explain and understand ECD differently