Technical Debt

November 18, 2013
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Technical debt — also referred to as design debt or code debt — refers to the work that teams prioritize lower, omit, or do not complete as they work toward creating the primary deliverables associated with the project’s product. Technical debt accrues and must be paid in the future.

Some causes of technical debt can include the following:

  • Quick-fix and building deliverables that do not comply with standards for quality, security, long-term architecture goals, etc.
  • Inadequate or incomplete testing
  • Improper or incomplete documentation
  •  Lack of coordination among different team members, or if different Scrum Teams start working in isolation, with less focus on final integration of components required to make a project or program successful
  •  Poor sharing of business knowledge and process knowledge among the stakeholders and project teams
  •  Too much focus on short-term project goals instead of the long-term objectives of the company.

This oversight can result in poor-quality Working Deliverables that incur significant maintenance and upgrade costs. In Scrum projects, any technical debt is not carried over beyond a Sprint, because there should be clearly defined Acceptance and Done Criteria. The functionality must satisfy these criteria to be considered done. As the Prioritized Product Backlog is groomed and User Stories are prioritized, the team creates Working Deliverables regularly, preventing the accumulation of significant technical debt. The Scrum Guidance Body may also include documentation and definition of processes which help in decreasing technical debt.

To maintain a minimal amount of technical debt, it is important to define the product required from a Sprint and the project along with the Acceptance Criteria, any development methods to be followed, and the key responsibilities of Scrum Team members in regards to quality. Defining Acceptance Criteria is an important part of quality planning and it allows for effective quality control to be carried out during the project.

Technical debt is a very big challenge with some traditional project management techniques where development, testing, documentation, etc. are done sequentially and often-times by different persons, with no one person being responsible for any particular Working Deliverable. As a result, technical debt accrues, leading to significantly higher maintenance, integration, and product release costs in the final stages of a project’s release. Also, the cost of changes is very high in such circumstances as problems surface in later stages of the project. Scrum framework prevents the issues related to technical debt by ensuring that done deliverables with Acceptance Criteria are defined as part of the Sprint Backlog and key tasks including development, testing, and documentation are done as part of the same Sprint and by the same Scrum Team.

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