Going strong as a custom business software development firm since 1973, JAHL Data Systems is located in Klamath Falls Oregon, high on the eastern slopes of the Pacific Cascades on the shores of Klamath Lake. JAHLʼs philosophy of “zero tolerance for inaccuracy” was adopted early when the companies original focus was on developing Accounting Software and Asset Management Tools. That philosophy continues today with a current concentration on Data Processing, Data Search and Data Delivery for List Products. Although the primary databases with which JAHL works are White & Yellow Page directories files, the data improvement processes and search & delivery capabilities are regularly applied to a wide variety of additional customer datasets. For the past decade JAHL Data Systems has been delivering to clients a series of customizable upgrades to various directories databases, including US and Canadian White and Yellow Page files, US Non-Published and US Cell Phone files. These upgrades always originate from actual customer requirements and are created by JAHLʼs programming staff, whose technical experience stretches back more than 35 years.