WASHINGTON » Four years after President Barack Obama vowed to "dramatically reform the way we do business on contracts," the spectacular failure of the HealthCare.gov website has renewed calls for changes in how the government hires and manages private technology companies.

But despite Obama’s promises in the last two months to "leap into the 21st century," there is little evidence that the administration is moving quickly to pursue an overhaul of the current system in the coming year.

Outside experts, members of Congress, technology executives and former government officials say the botched rollout of the Affordable Care Act’s website is the nearly inevitable result of a procurement process that stifles innovation and wastes taxpayer dollars. The Air Force last year scrapped a $1 billion supply management system. Officials abandoned a new FBI system after spending $170 million on it. And a $438 million air traffic control systems update, a critical part of a $45 billion nationwide upgrade that is years behind schedule, is expected to go at least $270 million over budget.

Long-standing laws aimed at preventing corruption and conflict of interest often saddle agencies with vendors selected by distant committees and contracts that stretch for years, even as technology changes rapidly. The rules frequently leave the government officials in charge of a project with little choice over their suppliers, little control over the project’s execution and almost no authority to terminate a contract that is failing.

"It may make sense if you are buying pencils or cleaning services," said David Blumenthal, who during Obama’s first term headed a federal office to promote the adoption of electronic health records. But it does not work "when you have these kinds of incredibly complex, data-driven, nationally important, performance-based procurements."

The Standish Group, an information-technology firm, deemed just 4.6 percent of large-scale government contracting projects executed in the past decade to be successful. More than half were "challenged," and about 40 percent simply "failed."

Big, multinational companies with large legal teams are often successful at winning years-long government contracts. But officials say technology innovation – particularly on Web-based projects like the health care site – is often found in smaller firms, like many in Silicon Valley, that lack the size and know-how to navigate the costly procurement maze.

"It’s a punishing and punitive environment to work in," said Stan Z. Soloway, the chief executive of the Professional Services Council, a trade group, and a former Clinton administration official.

Officials said the administration is conducting a "review of options" for improving the government’s use of technology and is beginning to discuss the issue with stakeholders inside and outside government. But they declined to say whether Obama would call for changes in how Washington delivers technology projects during his State of the Union address early next year and whether the White House had any specific plan to make good on the president’s oft-stated interest in tackling the thorny, bureaucratic issue.

"This administration has made considerable progress in reforming federal IT management practices," said Steven Posner, a spokesman for the White House budget office, citing new open-data and cloud-computing initiatives. "As the president made clear, significant challenges remain in the area of federal IT, and we need to continue improving the way we deliver technology."

In Obama’s first term, the administration pushed agencies to move away from expensive, dedicated hardware by adopting more flexible and cheaper, Internet-based services when possible. Officials also began requiring agencies to replace proprietary data with modern, open formats that can be easily understood by the public and the private sector.

But lawmakers and others said the Obama administration is doing too little to fix the fundamental problems, and they predicted that the issue would be punted to the years ahead, ultimately falling to Obama’s successor. Rep. Gerald E. Connolly, D-Va., said the budget office, formally known as the Office of Management and Budget, refused to back bipartisan legislation that proposes to consolidate responsibility for technology projects in a single person at each agency and to increase the transparency of government spending on technology.

"OMB takes the position, as it usually does, that we don’t need legislation to address these issues," said Connolly, who represents a Washington suburb with hundreds of federal technology contractors. "OMB was really our biggest stumbling block. It was maddening."

Officials denied Connolly’s charge, saying the administration is open to legislation but had "some concerns" with the bill in the House because it did not apply to the Pentagon. A Senate version of Connolly’s legislation in the House was introduced last week by a Democrat and a Republican, but also centers on the civilian agencies.

Aides pointed to the president’s recent comments about procurement as evidence that the administration is eager to confront the broader problem.

In an interview on MSNBC in mid-November, Obama bemoaned systemic problems in big technology projects, saying that "our IT systems, how we purchase technology in the federal government, is cumbersome, complicated and outdated." He reiterated that thought in his news conference Friday, and he has pledged to "refocus" on the issue during the rest of his term.

Last Tuesday, Obama met with 15 executives from some of the nation’s largest technology companies, including Tim Cook of Apple and Sheryl Sandberg of Facebook. Administration officials said the meeting was a first step in confronting the broader issue highlighted by the health care website debacle.

Technology experts from across the political spectrum agree that there are many problems to fix, from the White House down to the civil servants who administer the half-trillion dollars the government spends a year on procurement contracts, about 15 percent of its total budget.

"It’s not just the contracting rules," Soloway said. "It’s the human capital, the way the government buys services, the way the government determines its own requirements, the lack of collaboration within government, the lack of collaboration between the government and the private sector, the outdated systems within government."

Jim Johnson, the chairman of the Standish Group, said that the government often requires sweeping, singular contracts for projects that private businesses would complete in pieces.

"It’s an iterative style," Johnson said. "That’s how Google does it. That’s how eBay does it." Johnson said that the government’s successes tend to come from small, focused projects, which might attract more and more competitive bids. The success rate for small-scale government contracting projects in the past decade, according to his firm’s analysis, is nearly 55 percent.

The red tape also makes it difficult, if not impossible, for federal agencies to get the technology they need fast enough. "Agency leadership’s need for speed and agility has far outstripped the procurement and finance models," Richard Spires, the former chief information officer of the Department of Homeland Security, told a congressional panel this year.

In addition, strict rules prevent the government from working closely with contractors once it has hired them. Blumenthal, the former Obama administration official, said the government system of managing technology projects is broken.

"I think there has to be some middle ground between the current straitjacket and the perfect process that allows any kind of vetting you might want to have," said Blumenthal, who was responsible for distributing $30 billion in federal money to doctors and hospitals.

"I didn’t realize how much of a constraint or how disabling it was until I went to the private sector," he added.

Administration officials said they agree with critics that the government needs to move away from an old-fashioned method of technology development that relies on a single, large vendor to develop technology in years-long contracts.

Experts said that the HealthCare.gov debacle might ignite movement toward common-sense reforms. "There’s certainly momentum," said Mike Hettinger of the Software and Information Industry Association, a trade group.

But Connolly, the Virginia lawmaker, said that he sees little evidence of a new push by the administration, even as he expressed hope that the president would make the issue more of a priority.

"The president gets it," Connolly said. "Now we need to make sure the people who work for him get it."

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Michael D. Shear and Annie Lowrey, New York Times