The General Services Administration is readying a new contracting program designed to help federal agencies buy complex professional services, from consulting to engineering.

The program, known as One Acquisition Solution for Integrated Services, or OASIS, is expected to have a $12 billion ceiling value, said Aliya Nagimova, a research analyst at Herndon-based Deltek, which analyzes the government contracting market. The GSA said in a statement that it has not determined the ceiling value.

The program is a “brand-new, next-generation vehicle,” Nagimova said, noting that GSA has schedules for specific services, such as financial or consulting services, but doesn’t have an acquisition program to buy complex combinations of services.

While the program will be primarily focused on services like program management, consulting and professional engineering, it will also have an information technology component, Nagimova said.

The agency “realize[s] that there’s a greater demand now for complex professional services,” she said.

In a statement, the GSA said professional services awards grew 135 percent between 2003 and 2010, hitting nearly $80 billion.

The GSA “realized there were many complex professional service requirements which could not be acquired easily through [multiple-award schedules] or any other procurement vehicle,” the agency wrote.

The agency said OASIS will have a small business subcontracting goal of 50 percent, but that it is also considering issuing a second solicitation that would be fully designated for small businesses and include tracks for niche small businesses such as those owned by veterans.

The GSA said it has already gathered industry feedback on the program, including holding one-on-one sessions.

Based on these discussions with contractors, the GSA is considering broadening the program to include more professional services, such as energy, environmental and security.

Nagimova said a draft solicitation could be issued this summer and a final version in the winter. The GSA said it plans to announce awards next summer.

Almost 660 of Deltek’s members have marked the opportunity as one of interest.