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Maintenance Technical Debt

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Globant's After Going Live Studio Presentation.

What to do with old software. Transform and evolve.

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Maintenance Technical Debt

  1. 1. After Going Live Studio Presentation 2014
  2. 2. What to do with old software The older your code gets the more lines of code it accumulates, the more closely coupled modules become and the higher the effort to maintain and evolve your product. So, what should we do with old software? ● Rewrite it: Just throw it away. When maintenance cost is very high and the source code doesn’t have any economic value, this is the best option. Even though this could seem an easy task, duplicate a system behavior is almost impossible and very expensive for big products, so this is a hard decision. ● Harvest from it: A piece of software could be old but we can always learn from it since it may contain solid parts that have been working for years of real use. Study the software to reuse most of its ideas or design in a new system is also known as Software Archaeology. ● Wrap it up: The most common problem with old great software is that it needs to be integrated with newer technologies. So, we can also consider take that good code, put a wrapper around it and press on. From the inside the great old code, from the outside ready to be integrated with modern technologies. ● Transform it: Most of the software will be in this category for most of their lifecycle. The maintenance cost is not high and product keeps evolving to provide more business value. The key factor is be able to keep the software in this stage as long as possible doing a trade off to control technical debt. Harvest / Wrap up Transform Maintenance Cost Business Value Rewrite
  3. 3. Transform and evolve software - Technical debt Technical debt is metaphor referring to the consequences of poor software. Like a financial debt, the technical debt incurs interest payments that come in the form of the extra effort that we have to do in future maintenance. Often, it’s the result of a series of good or necessary tradeoff decisions made over time justified by their immediate ROI or the needs of a project. We can choose to continue paying the interest, or we can pay down the principal by refactoring and improving the solution. In a recent Forrester Research survey of IT leaders at more than 3,700 companies, companies estimated that they spend an average 72% of the money in their budgets on such keep-the-lights-on functions supporting ongoing operations and maintenance, while only 28% of the money goes toward new projects. How can we do it better??
  4. 4. Transform and evolve software - Technical debt strategy How does it work? Where we are? Technical debt is assessed in 7 categories in order to better drive your decisions. Categories are organized in a pyramid because it reflects how our efforts should be focused. For example: ● in order for a software application to be able to be easily maintained it has to be testable, reliable, upgradable, performing and maintainable. ● To work on Reusability we need a solid base or we would spread problems among many applications. How to deal with this? The first key milestone is to know where you stand in terms of your technical debt and set a baseline. Modern tools like Sonar allow us to take instant metrics, assess the economic value of your technical debt, among others, in order to compare the money we are investing on each category and ROI of the reverse technical debt plan. There are 2 bigs ways to approach a payback for Technical Debt: ● a big bang approach that fixes everything at once (which almost never is a smart strategy) ● a selective approach to reduce the items with highest severity in specific categories. According to your strategic plan for that application you could prioritize items in order to achieve your strategic goals.
  5. 5. Closing Are you ready for smart maintenance? info@globant.com

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