The purposes of this study were to develop an informal language inventory for classroom teachers to use in screening a child's speech, to have classroom teachers use the inventory with students to determine if they could use it, and to determine if teachers would use the assessment form after they had had some experience with it. The development of the informal language inventory involved the expertise of researchers, both through literature and through a panel of authorities who were asked to examine it. Twenty-one second and third grade teachers in Fort Riley and Junction City, Kansas, used the "Informal Language Inventory: Practical Assessment Form for Elementary Classroom Usage" to elicit speech samples of five of their students and also filled out a questionnaire expressing their opinions concerning understanding, value, and use of the Informal Language Inventory. The results of this study indicated that the Informal Language Inventory is pedagogically and linguistically sound if the opinions of the researchers and experts called on for assistance in construction and validation are respected, if the philosophy of the literature is valid, and if the classroom teacher follows the procedures suggested in the inventory. (Author/RB)