Construction For the past 25 years, Sigma Data Systems, Inc. has provided programming services to mid-sized construction firms. Our customers rely on our technical and professional expertise when it comes to supporting and enhancing their information systems. Whether its an IBM mid-range system or a Windows 2000 network environment we provide the solutions that make their information systems work for them. Construction accounting, job estimating and job cost tracking are our specialties. Construction companies looking for solutions to their information systems needs look to Sigma Data Systems, Inc.   *** Click here for AC/4 distribution software from Sigma Data Systems *** cmms-software.htm equipment-maintenance-software.htm maintenance-scheduling.htm work-order-printing.htm cmms-software.htm equipment-maintenance-software.htm maintenance-scheduling.htm work-order-printing.htm cmms-software.htm work-order-printing.htm maintenance-scheduling.htm work-order-printing.htm