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Requirements Technical Debt (RTD) applies the Technical Debt (TD) metaphor to capture the consequences of sub-optimal decisions made concerning Requirements. Understanding the quantification of RTD is key to its management. To facilitate this understanding, we developed a conceptual model, the Requirements Technical Debt Quantification Model (RTDQM). Our work is grounded in the literature found via a systematic mapping study and informed by prior work modeling the quantification of software code-related TD types. The key finding is that although RTD is similar to code-related TD in many aspects, it also has its own components. RTD can be incurred regardless of the presence of code-related TD. Unlike code-related TD, RTD has a feedback loop involving the user. RTD can have a cascading impact on other development activities, such as design and implementation, apart from the extra costs and efforts incurred during requirements engineering activities; this is modeled by the RTD Interest constituents in our model. The model was used to compare and analyze existing quantification approaches. It helped identify what RTD quantification concepts are discussed in the existing approaches and what concepts are supported by metrics for their quantification. The model serves as a reference for practitioners to select existing or to develop new quantification approaches to support informed decision-making for RTD management.
Requirements Technical Debt (RTD) applies the Technical Debt (TD) metaphor to capture the consequences of sub-optimal decisions made concerning Requirements. Understanding the quantification of RTD is key to its management. To facilitate this understanding, we developed a conceptual model, the Requirements Technical Debt Quantification Model (RTDQM). Our work is grounded in the literature found via a systematic mapping study and informed by prior work modeling the quantification of software code-related TD types. The key finding is that although RTD is similar to code-related TD in many aspects, it also has its own components. RTD can be incurred regardless of the presence of code-related TD. Unlike code-related TD, RTD has a feedback loop involving the user. RTD can have a cascading impact on other development activities, such as design and implementation, apart from the extra costs and efforts incurred during requirements engineering activities; this is modeled by the RTD Interest constituents in our model. The model was used to compare and analyze existing quantification approaches. It helped identify what RTD quantification concepts are discussed in the existing approaches and what concepts are supported by metrics for their quantification. The model serves as a reference for practitioners to select existing or to develop new quantification approaches to support informed decision-making for RTD management.
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