After the implementation of a new financial solution the business analyst (BA) observes that the performance of a solution does not meet the anticipated benefits detailed in the original business…

A data flow diagram models how data moves through a system and is used during requirements modeling, not for diagnosing why a deployed solution failed to meet its benefit targets.

A fishbone diagram - also called a cause-and-effect or Ishikawa diagram - is a root cause analysis technique that structures potential causes of a problem into categories such as people, process, technology, and environment. When a financial solution underperforms against its business case, this technique allows the BA to trace the benefit shortfall back to its underlying causes, enabling targeted corrective action rather than guesswork.

Business capability analysis assesses what the organization is able to do at a strategic level and does not provide root cause analysis for a specific solution's performance shortfall.

Interface analysis examines how systems and components interact with each other and is a requirements technique, not a root cause analysis method for post-implementation benefit gaps.