The Constipation Assessment Scale (CAS) is a valid and reliable measure found to be predictive of the presence and severity of constipation in the adult population, however it has never been tested in the pediatric population. A pilot study utilizing the CAS tool in children diagnosed with cancer will be conducted. The process for evaluating the presence and severity of constipation and the reliability and validity of the CAS tool will be tested. The study population will consist of inpatients and outpatients less than or equal to 21 years old, receiving weekly vinca alkaloids and/or narcotics greater than or equal to 2 times per day for pain management. Patients will be followed for 7 days after the last dose of vinca alkaloid and/or narcotic for a maximum of 6 weeks. Patients will be assessed on admission for bowel function and constipation. The admission assessment will include a nursing and nutrition assessment, review of the history and physical, and the administration of the CAS. Subsequent assessments include nursing, nutrition, administration of the CAS, and a patient daily bowel diary.