# Estimation
24 items
2x/3x Rule
A time estimation guideline suggesting you should double or triple your initial estimate for complex projects to account for unforeseen delays, interruptions, and complications, directly addressing the planning fallacy and Hofstadter's Law.
Agile Story Points & Velocity
A relative estimation method in Agile that measures complexity, effort, and risk rather than time, using techniques like Planning Poker and tracking team velocity for predictable sprint planning.
AI Task Duration Prediction
Machine learning feature in planning tools like Trevor AI that automatically estimates task duration based on historical data and task characteristics, improving schedule accuracy and preventing chronic underestimation.
Analogous Estimation
Project planning technique using historical data from similar past projects to estimate duration and resource needs, leveraging organizational knowledge for more accurate time predictions.
Big Agile
An agile methodology resource platform providing comprehensive guides on estimation and prioritization frameworks including RICE (Reach, Impact, Confidence, Effort). Offers educational content on agile practices, scaling methodologies, and time estimation techniques for development teams.
Bottom-Up Estimation
Project time estimation technique that breaks projects down into smaller, manageable tasks for detailed estimation, then aggregates them for an overall project timeline. Provides high accuracy through granular analysis and team involvement.
Expert Judgment Estimation
Time estimation approach that leverages the knowledge and experience of subject matter experts to predict task duration and resource requirements for projects.
Hofstadter's Law
Cognitive principle stating that tasks always take longer than expected, even when accounting for Hofstadter's Law itself. Proposed by Douglas Hofstadter in 1979, this recursive law helps explain chronic underestimation in project planning.
Honor System Method
A time tracking approach relying on employee self-reported estimates of time spent on projects, also known as rule-of-thumb estimation. It is the easiest and cheapest method but suffers from inaccuracy and lack of detailed records.
Parametric Estimating
Project estimation technique that uses statistical relationships between historical data and variables to calculate time and cost estimates based on measurable parameters.
Parametric Estimation
Statistical estimation technique using mathematical models and historical data to calculate project duration and costs based on measurable parameters like lines of code or square footage.
PERT Estimation (Program Evaluation and Review Technique)
Project time estimation methodology that accounts for uncertainty by using three time estimates: optimistic, most likely, and pessimistic. Originally developed by the US Navy for complex project planning and critical path analysis.
Planning Fallacy
Cognitive bias where people underestimate the time, costs, and risks of future actions while overestimating the benefits. Related to Hofstadter's Law and critical for accurate time estimation in project management.
Planning Poker
Agile estimation technique where team members use cards to provide time/effort estimates for tasks anonymously before discussion. Combines individual expertise with team consensus to improve estimation accuracy and reduce anchoring bias.
Premortem Analysis
A project planning technique where teams imagine a project has failed and work backwards to identify what could go wrong, helping combat the planning fallacy by surfacing potential obstacles and risks before they occur.
Project Phase Tracking
Categorizing time entries by project lifecycle stage (discovery, design, development, testing, deployment) to analyze where effort is concentrated, improve future estimates, and identify process bottlenecks across the development workflow.
Project Templates for Time Estimation
Reusable project structures with pre-defined tasks and time estimates based on historical data, enabling faster project setup and more accurate time budgeting.
Project Time Estimation Best Practices
Methods and techniques for accurately estimating how long projects and tasks will take, including the planning fallacy, buffer time, and historical data analysis.
Reference Class Forecasting
A time estimation technique that combats the planning fallacy by basing predictions on actual durations of similar past projects rather than internal assessments, using historical data to create more accurate and realistic timelines.
SimplEstimate
Project estimation software designed to help businesses create accurate cost and time estimates in minutes. Simplifies the estimation process with digital tools that replace manual methods, making it easier for contractors, service providers, and businesses to generate professional quotes and project plans.
Three-Point Estimation
Risk-aware time estimation technique that calculates expected duration using optimistic, most likely, and pessimistic scenarios to account for uncertainty in project planning.
Three-Point Estimation (PERT)
Project time estimation technique using three values: optimistic (best case), most likely (realistic), and pessimistic (worst case) scenarios to calculate weighted average. Originally developed for the US Navy's Polaris program, now widely used in project management for more accurate time and cost predictions.
Timeboxing with Estimation Practice
Time management approach combining fixed time allocation with accuracy tracking of estimates. Each task gets predetermined duration; actual time is recorded for comparison. Over time, improves estimation accuracy and reveals tasks consistently taking longer than expected.
Wideband Delphi
Structured consensus-based estimation technique where experts independently provide estimates, then iteratively refine them through facilitated discussion until convergence. Developed in the 1970s, this method reduces individual bias while leveraging collective expertise.