index.md 8.9KB
title: Software maintenance is an anti-pattern
url: https://18f.gsa.gov/2016/02/23/software-maintenance-is-an-anti-pattern/
hash_url: e6f00d9b48
In his 1977 book “A Pattern Language: Towns, Buildings, Construction”, Christopher Alexander defined ways to architect physical spaces to enhance and support how people interact. This concept was very influential in software development, leading to the popularization of software design patterns, which identified ways in which we construct software that are mostly independent of a programming language. These are patterns of how software components behave and interact — ways to effectively solve common problems.
This book also inspired the idea of an anti-pattern, which is a common response to a problem that appears to solve the issue, but is actually ineffective and even counterproductive. This term has grown to include social patterns of human interaction, as well as software patterns.
Software maintenance is the common practice where, after a software project is “complete,” a small, often part-time team or a single developer ensures critical upgrades and fixes serious bugs, with limited improvements, as time allows. This is commonly referred to as Operations & Maintenance, or by its acronym, O&M. Software is never complete in its first release, so devoting ongoing staff to sustain a piece of software is a necessary practice. However, at some point, when the audience for a particular piece of software is no longer growing, it’s appropriate to reduce staff devoted to sustaining a software project.
Governments often use two anti-patterns when sustaining software: equating the "first release" with "complete" and moving to reduce sustaining staff too early; and how a reduction of staff is managed when a reduction in budget is appropriate. To address the latter anti-pattern, managers need to rethink how they approach spending their O&M budget.
What happens in private industry?
In the software industry, software is not considered complete when it’s first released. The first release is the very beginning of the journey. In successful software projects, the first version is always released with open issues, deferred features, and a roadmap (or at least ideas) of how it can and should be improved in the future. The team will immediately start developing new features and fixing bugs and typically will get larger over time, not smaller. Investing more to increase the size of the team is justified in the private sector since companies will remain focused on a growing market with growing revenue.
When the market stops growing and becomes saturated or declines and revenues decrease, the investment in the software will be reduced to be as small as possible. There’s an awareness that the software is on life support, expected to die a slow death as customers become increasingly dissatisfied.
Maintenance invites technical debt
When a maintenance team is staffed with a skeleton crew, the team does not have the time or authority to do user research or validate that software is effectively meeting the needs of users. Instead, a support team queues up a list of issues that are ranked based on negative impact. The impact is typically assessed by the level of complaints and measured by the expense of staffing the customer support line. It’s assumed that “fixing” the bug will lead to a lower volume of complaints.
We know from experience that a complaint is often the tip of the iceberg, reporting a symptom rather than the cause. When software is in active development, we might look at a collection of a dozen bugs and realize that altering the design of the feature will be a less expensive approach and lead to increased customer productivity and ease of use. Fixing any one or two bugs can seem like the right solution in the short-term, but often doesn’t actually lead to a decrease in customer complaints, or worse, can lead to the “whack a mole” phenomenon when a developer will fix one bug only to cause another to pop up.
The software is then allowed to grow old until a full rewrite or replacement is needed.
It’s precisely this model of maintenance that has created the negative legacy of government software systems we face today.
A different model of software operations
Government software is different. There’s no profit motive. The market is fixed (or fluctuates slowly with population or employment changes). We need a model where we can create software that thrives when the number of users and usage remains constant. We need to be able to reduce costs when the software meets the needs of the people it serves, yet detect when changes are needed.
To create a new, productive pattern, we’ll still need monitoring that detects signs of trouble that could lead to outages, and to keep up with regular software upgrades for security concerns. However, we need to take a completely different approach to bug reports and customer complaints.
To keep teams from constantly plugging leaks while missing the reason the boat is sinking, we need to apply the principles of agile development and user centered design to how we work on software after the initial release. Instead of a small team working constantly to fix small bugs, an entire team should work in bursts of activity. A team might work on a few software projects focusing on a different project each quarter, depending on the data.
The key point is that a full cross-disciplinary team would devote its complete attention to the software for a sustained interval. Periodic discovery activities would be followed by a burst of implementation, then validation.
The discovery activities could take place once per year or every six months or could be triggered by a significant change in system health or usage metrics. The team would look at:
- User need. Who is using the product? Are they the same target user? Who is not using the product who might find it useful? What other products or services are they using?
- Competitive analysis. What exists in the marketplace that is similar to our solution? If there’s a clear competitor with market traction and a great user experience, the team should perform a cost analysis and if comparable with current costs, consider buying the solution.
- Usability test with a sampling of current users
- Triage the backlog of customer complaints, bug reports, and system health indicators — cross-reference with the results of usability tests and usage metrics. Make recommendation of key improvements and changes that would address underlying issues. Prioritize critical concerns.
- Net Promoter Score or other happiness metric to evaluate effectiveness of the software solution
Potential impact
We don’t know if this new approach will be successful, but we do know that the old approaches don’t work. We need alternate techniques to sustain software services at moderate budget levels so that we don’t simply re-create the failures of the past when digital services that meet the needs of today slowly become obsolete as the world changes around us.
This is particularly important as the pace of change is increasing, along with the interconnectedness of new government services that are increasingly delivered as web applications. In the ‘70s and ‘80s, we could build software that would essentially function as designed for 5-10 years. In the 90s, with the growth of the web and changes in how people use technology, that timeframe narrowed to 3-5 years. Now web applications need more frequent updates. As we move from a paper-based society to one that is increasingly connected and as our population increasingly relies on mobile devices and online services for their routine needs, we’ll need to make periodic improvements to keep our services relevant and up to date.
There will always be some software systems that need a dedicated team focused on continuous improvement. However, we also anticipate that government will always have a need for software systems that serve a stable audience of users with needs that might not change in a year, though they will change at some point, and we need to notice and respond to that change.
The potential impact of this kind of model will be to continue to reduce costs while delivering higher value to the people who use our services. If you see your agency follow this anti-pattern for O&M, talk to our transformation services team about helping to change how you sustain software.