title: How necessity produced a phone-based system.
authors.affiliation: DDI, Arlington Heights, IL, USA.
authors.forename: B
authors.initials: B
authors.lastname: Denniston
mesh_terms: D003362:Cost-Benefit Analysis; D018575:Home Care Services, Hospital-Based / Q000191:economics / Q000458:organization & administration*; D010562:Personnel Staffing and Scheduling Information Systems / Q000191:economics / Q000592:standards*; D012984:Software; D013689:Telephone; D013781:Texas; D013997:Time Factors; D014584:User-Computer Interface; D000078329:Workforce