What are the best practices for a bug severity system?

Define a few clear levels based on player impact, apply them consistently, and combine severity with reach to prioritize. Define a few distinct severity levels based on how bad the bug is for the player, e.g. game-breaking (blocks play, crashes, lost progress), major (significant but playable), minor (annoying), cosmetic (trivial), since levels grounded in player impact make severity meaningful for prioritization. Apply the levels consistently using clear definitions so the same kind of bug always gets the same severity, since a severity system only aids prioritization if it reliably means the same thing (inconsistent severity is meaningless). And combine severity with reach (how many players a bug affects) to prioritize, since severity is half of prioritization and reach is the other half, a high-severity bug affecting many players is top priority, while a high-severity bug affecting almost no one may rank below a moderate bug affecting many. A good severity system makes triage consistent by classifying how bad each bug is, which together with reach drives what to fix first, so the practices serve defining clear impact-based levels (so severity is meaningful), applying them consistently (so it's trustworthy), and combining with reach (so it drives prioritization correctly). The system should be simple, a few clear levels are better than many fine-grained ones you apply inconsistently, and it works alongside the affected-player counts that field crash capture provides, severity (how bad per player) times reach (how many players) gives you the impact-based priority that determines what to fix first.

How many severity levels should I use for bugs?

Use a few clear, distinct levels, typically around three to four, since the goal is a simple, consistently-applicable classification of how bad a bug is, not a fine-grained scale you apply inconsistently. A common and effective set is something like: game-breaking/critical (blocks play, crashes, lost progress, the worst), major (significant problem but the game is still playable), minor (annoying but doesn't seriously affect the experience), and cosmetic/trivial (barely matters). This handful of levels covers the meaningful distinctions in how bad bugs are for players while staying simple enough to apply consistently, which is essential since a severity system only helps if the same kind of bug reliably gets the same severity. More levels (say, a 1-10 scale or many fine-grained tiers) tend to be applied inconsistently, the distinction between a '6' and a '7' is fuzzy and subjective, so people classify the same bug differently, making the severity meaningless for prioritization, and the extra granularity rarely helps decisions (you mostly need to know: is this game-breaking, significant, minor, or trivial). Fewer, clearly-defined levels are better because they're applied consistently (the definitions are distinct enough that the same bug gets the same severity), which is what makes severity trustworthy and useful. For a small team especially, a simple three-or-four-level system with clear definitions is the right balance, enough to capture how bad bugs are without the overhead and inconsistency of a fine-grained scale. Remember that severity is one input to prioritization (combined with reach, how many players are affected), so the severity levels just need to distinguish how bad a bug is per player clearly enough to weigh against reach, which a few clear levels do well. So use a few clear severity levels (around three to four) based on player impact, with definitions distinct enough to apply consistently, rather than a fine-grained scale that's applied inconsistently and adds complexity without improving your prioritization.

How does severity relate to bug priority?

Severity (how bad a bug is per affected player) is one of the two main inputs to priority, the other being reach (how many players the bug affects), and priority combines them: a bug's priority is essentially its severity times its reach, so the highest-priority bugs are high-severity and high-reach (a game-breaker affecting many players), while a bug can be low-priority despite high severity if it affects almost no one, or despite high reach if it's only cosmetic. This distinction matters because severity alone doesn't determine priority, a game-breaking bug that only one player on an obscure configuration can hit may be lower priority than a moderate bug affecting a large share of your players, since the latter does more total harm. So when prioritizing, you use severity to capture how bad each bug is for a player who hits it, and reach (how many players are affected) to capture how widespread it is, and you combine them to get priority, fixing the bugs with the highest combination of severity and reach first. A severity system provides the 'how bad' input (consistently classifying each bug's severity), while affected-player counts (which field crash capture provides for crashes) provide the 'how many' input, and together they drive what to fix first. The practical upshot is that severity is necessary but not sufficient for prioritization, you also need reach, and the best prioritization weighs both: work the bugs that are both severe and widespread first (top priority), then weigh severe-but-narrow against moderate-but-widespread (where reach can make a less-severe-but-common bug higher priority than a severe-but-rare one), and defer the low-severity, low-reach tail. So severity relates to priority as one of its two key components: it tells you how bad a bug is, which you combine with how many players it affects to determine its priority. A good severity system, with clear consistent levels based on player impact, gives you the reliable severity input, and combining it with reach (affected-player counts) gives you impact-based priority that correctly determines what to fix first, which is the goal of both the severity system and prioritization.

Best Practices for a Bug Severity System

Quick answer: Define a few clear severity levels based on player impact (game-breaking down to cosmetic), apply them consistently, and combine severity with reach to prioritize. A severity system makes triage consistent.

A severity system classifies how bad each bug is, which is half of prioritization (the other half being reach). Here are the best practices for a bug severity system.

Define a Few Clear Severity Levels Based on Player Impact

A severity system needs clear, distinct levels, so define a few based on player impact, e.g. game-breaking (blocks play, crashes, lost progress), major (significant but playable), minor (annoying), cosmetic (trivial). Levels based on player impact make severity meaningful for prioritization.

Bugnet ranks by affected players, which combines with your severity levels. Defining a few clear severity levels based on player impact is the foundation, since severity is fundamentally about how bad a bug is for the player.

Apply Severity Consistently

A severity system only works if applied consistently, so use clear definitions so the same kind of bug always gets the same severity. Consistent severity makes the classification trustworthy for prioritization, while inconsistent severity makes it meaningless.

Bugnet's structured issues support consistent classification. Applying severity consistently is what makes the system useful, since severity levels only aid prioritization if they reliably mean the same thing.

Combine Severity With Reach to Prioritize

Severity is half of prioritization; reach (how many players) is the other half, so combine them, a high-severity bug affecting many players is top priority, while a high-severity bug affecting almost no one may rank below a moderate bug affecting many. Combining severity and reach drives what to fix first.

Bugnet ranks issues by affected players, which you weigh with severity. So practice a bug severity system by defining a few clear levels based on player impact, applying them consistently, and combining severity with reach to prioritize, making triage consistent and driving what to fix first.

Define a few clear severity levels based on player impact (game-breaking down to cosmetic), apply them consistently, and combine severity with reach to prioritize. A severity system makes triage consistent.