Estimating is a critical part of project planning, involving a quantitative estimate of project costs, resources, or duration.

Here's a starting summary of Estimating **Want To Learn How To Estimate? Part Troisième**

And blogs that speak to estimating projects in the presence of uncertainties that create risks to cost, schedule, and technical performance, going back to 2005

**The Economics of Strategy****Epistemic and Aleatory Uncertainty Creates Risk to Project Success****How Do Projects Fail? Let Us Count the Ways****The Story Counting Fallacy Without Knowing Underlying Statistics****Ignorance Versus "Willful Ignorance"****Without a Road Map, We're Driving in the Dark With The Lights Off****Software Estimating Processes and the Fallacy of the Week****Function Points and Software Development Estimating****Non-Ergodic Behaviour of Projects****Why Johnny Can't Do The Math****Why Johnny Can't Estimate? (Update)****How To Produce and Covey Credible Software Development Estimates****Start with the End in Mind****You Can Not "Control" Projects****Value Theory for Projects and Estimating****Predicting the Unpredictable (A Book Review)****Phrases Used for Technical Performance Measures****Are Estimates Really The Smell of Dysfunction?****What Are Story Points and How Can They Be Used on Agile Projects?****Cost and Value Management for Software Development****3 Questions That Must Be Asked at Every Project Management Meeting****Decision Analysis - Ordinal and Cardinal Measures****Decision Making in the Presence of Uncertainty****Managing in the Presence of Risk****Modeling the Future is the Basis of Project Success****Reading List for the Cone of Uncertainty****Why Johnny Can't Estimate? (Update)****Don't Be Fooled****Are Estimates Really The Smell of Dysfunction?****Classification of Different Types of Uncertainty****Monte Carlo Simulation****Mathematics for Engineering and Software Development****Value, Cost, and Business Decision Making****Why Estimates are Needed for Success in the Nondeterministic Universe****Real Options and Decision Making for ICT Projects****Average is Just a Number - Fallacy of the Week****Modeling the Future Using Empirical Data from the Past****Reasons to Estimate and Measure****Small Batch Sizes are NOT Risk Management****Microeconomics and Risk Management in Decision Making for Software Development****Monte Carlo Simulation****Uncertainty creates Risk, Decisions in Presence of Uncertainty Requires Estimating****Principles of Cost and Schedule Estimating****Fallacy of the Day - Estimation is pretentious rationalism****Cone of Uncertainty and Estimate to Complete and Estimate at Completion****Cone of Uncertainty Bibliography****Resources for Cone of Uncertainty****When to Estimate and When Estimates aren't Needed****Independent Cost Estimating (ICE)****Behavioral Economics, Estimating, and Decision Making in Presence of Uncertainty****When Will The G-Line Be Ready For Use?****The Flaw of Average (Mean) and Its Cousin Mode and Median****4 Fallacious Reasons Why We Estimate and Why Those Are Fallacious****Deconstructing The Cone of Uncertainty****Why Johnny Still Cannot Estimate****What is an Estimate? What is Estimating?****GAO Cost Estimating and Assessment Guide Applied to Agile****Estimating Tools and Resources (Updated)****Numbers and Their Usefulness in Decision Making****Misinterpretations of the Cone of Uncertainty****Decisions Without Estimates?****The Five Laws of Software Estimating are Wrong****How to Talk About Estimates****Median, Mean, Mode without Variance is Worthless****Misunderstanding Making Decisions in the Presence of Uncertainty (Update Part 2)****Managing in Presence of Uncertainty****Cone of Uncertainty - Part Cinq (Updated)****Managing Uncertainty, Risk, Threat, and Opportunity****Cost Estimating Assessment Criteria****Estimates, Forecasts, Projections (Update)****Estimating is a Learned Skill****Closed-Loop Control and Granularity of the Estimating Process****Agile Estimating Methods and Impact on Project Development Performance Index****Estimating on Non-Trivial Software Projects****Quick Summary of Estimating Advice****Book of the Month - IT Project Estimation: A Practical Guide to the Costing of Software****How to Estimate Any Software Problem****Estimating is an Everyday Life and Everyday Projects****How Do You Estimate Work That's Never Been Done Before?****NOT Negotiating Estimates is an Example of Bad Management (Update)****Forecasting Cost and Schedule Performance in the Presence of Uncertainty****Estimating the Future Based on What We Know Today****Estimating Software Intensive Systems****Debunking: The Five Laws of Software Estimating****Decision Making in the Presence of Uncertainty****The Unmyths of Estimating****Determining Schedule Margin with Monte Carlo Simulation****Deterministic, Probabilistic, and Empiricism****Why We Need To Estimate Software Cost and Schedule****Estimates and Commitment****The Flaw of Averages****Reasoning About the "Estimating" Problem****Why Guessing is not Estimating and Estimating is not Guessing****Estimating and Making Decisions in Presence of Uncertainty****Estimating Processes in Support of Economic Analysis****What Happened to our Basic Math Skills?****Making Decisions In The Presence of Uncertainty (Part 1)****Information Technology Estimating Quality****Climbing Mountains Requires Good Estimates****Monte Carlo Simulation of Project Performance****The Fallacy of the Planning Fallacy****Forecasting the Future is Critical to All Success****The Flaw of Empirical Data Used to Make Decisions About the Future****Approximating for Improved Understanding****How to Avoid the "Yesterday's Weather" Estimating Problem****Some More Background on Probability, Needed for Estimating****Critical Success Factors of IT Forecasting****Flaw of Averages****Calculating Value from Software Projects - Estimating is a Risk Reduction Process****Five Estimating Pathologies and Their Corrective Actions****Estimating Probabilistic Outcomes? Of Course, We Can!****Empirical Data Used to Estimate Future Performance Re-Deux****The Cost Estimating Problem****What does it mean when we say 80% confidence in a number?****Sources for Reference Class Forecasting****We Suck At Estimating****Estimating is Risk Management****Planning And Estimating Is Required for Project Success****Bayesian Statistics and Project Work****Planning is the Basis of Decision Making in the Presence of Uncertainty****Three Increasingly Mature Views of Estimate Making in IT Projects - Update****Estimating Guidance - Updated****Bad Estimation Is a Systematic Problem****Estimating on Agile Projects****Constructing a Credible Estimate****Software Estimating for Non-Trivial Projects****Show Me Your Math****Estimating Guidance****Should I Be Estimating My Work?****Decision Making Without Estimates?****How to Estimate Software Development - Update****Estimating Software-Intensive Systems****Statistical Significance****Why We Must Learn to Estimate****Making Estimates For Your Project Requires Discipline, Skill, and Experience****An Agile Estimating Story****The Three Elements of Project Work and Their Estimates****How To Fix Martin Fowler's Estimating Problem in 3 Easy Steps****Is There Such a Thing As Making Decisions Without Knowing the Cost?****Why Johnny Can't Estimate or the Dystopia of Poor Estimating Practices****Some more answers to the estimating questions****8 Reasons Why Estimates Are Too Low****Three Kinds of Uncertainty About the Estimated Cost and Schedule****It's an Estimating Problem not A Problem with Estimating****Let's Stop Guessing and Learn How to Estimate****How To Estimate, If You Really Want To (Updated)****The Value of Making An Estimate****How To Estimate Almost Anything If You Really Want To****Facts and Fallacies of Estimating Software Cost and Schedule****Estimating Accuracy****Nice Estimating Example****How To and How Not To Make Credible Estimates of Cost and Schedule****Books for Cost and Schedule Forecasting****How To Estimate Almost Any Software Deliverable in 90 Seconds****Estimating Cost, Schedule, and Technical Performance****Reference Class Forecasting for Software Estimating****Software Estimating Taxonomy****Software Cost Estimating Information - Updated****Alternatives to Agile Estimation****Forecasting The Future is Sporty Business, So Knowledge, Skill and Experience is Needed****Want to Forecast the Future? Here's How - Part 2****Can We Make a Decision Without Knowing the Cost?****How to Forecast the Future****How NOT to Estimate Anything****What's Gonna Cost and When Will We Be Done?****Why Estimating Is Mandatory****Credible Estimating Processes****Estimates and all that...****Why 3 Point Estimates Create False Optimism****Software Estimating****Using Estimates as a Management Tool**