Estimation
32 bites tagged Estimation — interview questions with model answers, and 60-second explainers.
How does a team forecast work for a Sprint?
Tests your grasp of Scrum's empirical forecasting. A great answer cites three inputs: the Product Backlog, past performance, and team capacity. The Developers pull the work; they don't have it pushed on them. A red flag is saying a manager dictates the scope.
Roadmap Capacity Planning: Ideal vs. Reality
Capacity planning isn't about your team's ideal output (design capacity), but their actual output (effective capacity) after accounting for meetings, bugs, and on-call. Use it to build realistic roadmaps.
Story Points: Estimating Effort, Not Time
Story points measure effort, not hours. They combine a task's complexity, uncertainty, and volume into a single relative number. Agile teams use them to forecast work capacity.
Agile Spikes: Time-Boxed Research to Reduce Uncertainty
A spike is a time-boxed investigation to answer a question or reduce uncertainty. It's a story whose deliverable is knowledge, not shippable code. Spikes are used to de-risk complex stories or evaluate technical options.
Agile Velocity: A Forecasting Tool, Not a Target
Agile velocity isn't about speed; it's a measure of a team's predictable output per iteration. It's used to forecast how much work can be done in future sprints and to estimate release dates. The footgun is treating it as a productivity KPI.
Monte Carlo Forecasting: Probabilities, Not Promises
Monte Carlo forecasting trades a single due date for a set of probabilities. By running thousands of random simulations based on past performance, it generates a range of likely completion dates, not a single guess.
Relative Sizing: Estimate Effort, Not Hours
Relative sizing compares work items to each other instead of assigning absolute hours. A team agrees on a baseline task and estimates others as 'larger' or 'smaller' relative to it, often using story points. The footgun is mapping points back to hours.
Planning Poker: Avoid Groupthink in Estimates
Planning poker avoids groupthink in effort estimation. Team members reveal estimates simultaneously using cards, preventing the first number spoken from anchoring everyone else. It's used in Agile to size up tasks.
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