The worst time to decide whether to quit is when you are emotionally invested. To make rational choices, define specific, measurable conditions at the outset of a project or job that will automatically trigger a decision to walk away if they are met or missed.

Combat indecision and emotional attachment by pre-committing to sell an investment if it fails to meet a specific metric (the state) by a specific deadline (the date). This creates a pre-commitment contract that closes long feedback loops and prevents complacency with underperforming assets.

An investment thesis is a plot. The theatre rule of "Chekhov's Gun"—that a gun shown in Act 1 must fire by Act 3—is a powerful mental model. If a key catalyst for your investment doesn't materialize within your expected timeframe, the story has fundamentally changed, signaling that it may be time to exit.

To avoid emotional, performance-chasing mistakes, write down your selling criteria in advance and intentionally exclude recent performance from the list. This forces a focus on more rational reasons, such as a broken investment thesis, manager changes, excessive fees, or shifting personal goals, thereby preventing reactionary decisions based on market noise.

Instead of making emotional decisions, establish "kill criteria" for each investment: a specific KPI (a state) that must be met by a certain time (a date). If the company fails to meet the predefined metric, you sell. This provides a disciplined, objective framework for portfolio management.

The common advice to overcome sunk cost fallacy—"imagine you didn't own this, would you buy it today?"—is ineffective because you cannot truly ignore the reality of ownership. A more robust method is setting pre-commitment contracts or "kill criteria" that force a decision when specific signals are observed.

To avoid emotional, performance-chasing decisions, institutional LPs should create a 'kill list' for each manager. This document pre-defines the fundamental criteria for redemption, ensuring that exit decisions are based on a disciplined, pre-agreed framework rather than market noise.

True investment maturity isn't about holding through drawdowns. It's about recognizing when new information invalidates your thesis and selling immediately. The common instinct to defend a position by buying more is a costly mistake that turns event-driven plays into distressed holdings.

To avoid emotional decision-making, especially with losing positions, write down the specific criteria for any investment. Then, backtest those rules against historical data. This replaces emotional struggle with a systematic, data-driven process.