It forces you to confront your possible optimism by asking you to identify 3 different pieces of data:<ol>
<li>A best-case scenario estimate</li>
<li>A worst-case scenario estimate</li>
<li>A most likely scenario estimate</li></ol>Once you have your 3 numbers, calculate the average of the 3 points of data.

The three-point estimation

Start by asking: How long do such projects usually last?If you’re coding a new feature for your company’s app, look at how long it took your team to build and release a similar feature in the past. If you’re writing a 4,000-word blog-post, review your data showing how many hours/days it took you to write a similar piece previously. Then, base your estimates off of that data.

Use historical data

While we tend to be optimistic about our own abilities to complete tasks quickly, we’re much more pragmatic when it comes to figuring out how long it will take someone else to complete a task.

Search outsiders' perspectives

Is our tendency to underestimate the amount of time it will take to complete a task. Estimation mistakes can usually be attributed to 2 key factors:<ul><li>Failing to consider how long it’s taken us to complete similar tasks in the past.</li><li>Assuming that we won’t run into any complications that will cause delays.</li></ul>

The planning fallacy

When estimating any task or project, you have to take all of these things into account: There are things you know will happen, things you know could happen, and things you never once considered might happen.

Leave space for the unknown

And when your good mood is at its lowest point in the day. In that case, you may be feeling less optimistic, which could help you create more realistic estimates

Plan during the low point of your day

Over the last three years, I've painted five rooms in my house. The first room I painted was my bedroom, and I was convinced that I'd have the task finished in a weekend. A month later, I applied the finishing touches.

The planning fallacy

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The planning fallacy

Planning Fallacy

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