Manual for the Infant-Toddler and Family Instrument (ITFI) In the Manual, professionals will find detailed instructions on how to prepare for and complete each part of ITFI, tips on handling sensitive issues, guidelines to determine any need for further referrals, case studies that demonstrate how to use ITFI, and an appendix that details the field testing of ITFI. With these step-by-step instructions and suggestions, professionals will be able to administer ITFI accurately and ensure a positive experience for themselves, the caregiver, and the child.