The textbook "Quantitative Investigation" by Ruth Jäger-Jürgens and Elisabeth Jürgens offers a comprehensive introduction to quantitative research methods, specifically tailored to the needs of professionals in early childhood education. It covers fundamental concepts and techniques essential for conducting and analyzing quantitative studies. The authors combine theoretical foundations with practical examples to illustrate the application of these methods in educational practice. With 403 pages, the book provides an in-depth exploration of social science questions and supports educators in making informed decisions based on quantitative data. Its clear structure and accessible language make it a valuable reference work for both students and practitioners alike.