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An anti-pattern is a common response to a recurring problem that is usually ineffective and risks being highly counterproductive.^[1]^[2] The term, coined in 1995 by computer programmer Andrew Koenig,^[3]^[4] was inspired by the book Design Patterns, which highlights a number of design patterns in software development that its authors considered to be highly reliable and effective.

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The term was popularized three years later by the book AntiPatterns, which extended its use beyond the field of software design to refer informally to any commonly reinvented but bad solution to a problem. Examples include analysis paralysis, cargo cult programming, death march, groupthink and vendor lock-in.

Definition[edit]

According to the authors of Design Patterns, there are two key elements to an anti-pattern that distinguish it from a bad habit, bad practice, or bad idea:

The anti-pattern is a commonly-used process, structure of pattern of action that, despite initially appearing to be an appropriate and effective response to a problem, has more bad consequences than good ones
Another solution to the problem the anti-pattern is attempting to address exists, which is documented, repeatable and proven to be effective where the anti-pattern is not

Examples[edit]

Social and business operations[edit]

Organizational[edit]

Analysis paralysis: A project that has stalled in the analysis phase of development, and is unable to achieve support for any of the potential plans of its implementation
Bicycle shed: Giving disproportionate weight to trivial issues
Bleeding edge: Operating with cutting-edge technologies that are still untested or unstable, leading to cost overruns, under-performance or delayed delivery of the product
Bystander apathy: The phenomenon in which people are less likely to or do not offer help to a person in need when others are present
Cash cow: A profitable legacy product that often leads to complacency about new products
Design by committee: The result of having many contributors to a design, but no unifying vision
Escalation of commitment: Failing to revoke a decision when it proves wrong
Groupthink: A collective state where group members begin, often unknowingly, to think alike and reject differing viewpoints
Management by objectives: Management operating with the exclusive focus on quantitative management criteria, such as number of sales, when these are non-essential or cost too much to acquire
Micromanagement: Ineffective results stemming from excessive observation, supervision, or other hands-on involvement from management
Moral hazard: Insulating a decision-maker from the consequences of their decision
Mushroom management: Keeping employees 'in the dark and fed manure' (also 'left to stew and finally canned') about decisions being taken by management
Peter principle: Continually promoting otherwise well-performing employees up to a position they are unsuited for, with responsibilities they are incompetent at completing, where they remain indefinitely^[5]
Seagull management: Management in which managers only interact with employees when a problem arises, when they 'fly in, make a lot of noise, dump on everyone, do not solve the problem, then fly out'
Stovepipe or Silos: An organizational structure of isolated or semi-isolated teams, in which too many communications take place up and down the hierarchy, rather than directly with other teams across the organization
Typecasting: Locking successful employees into overly-safe, narrowly defined, predictable roles based on their past successes rather than their potential
Vendor lock-in: Making a system excessively dependent on an externally supplied component

Project management[edit]

Cart before the horse: Focusing too many resources on a stage of a project out of its sequence
Death march: A project whose staff, while expecting it to fail, are compelled to continue, often with much overwork, by management in denial of the project's possible failure^[6]
Ninety-ninety rule: Tendency to underestimate the amount of time to complete a project when it is 'nearly done'
Overengineering: Spending resources making a project more robust and complex than is needed
Scope creep: Uncontrolled changes or continuous growth in a project's scope, or adding new features to the project after the original requirements have been drafted and accepted (also known as requirement creep and feature creep)
Smoke and mirrors: Demonstrating unimplemented functions as if they were already implemented
Brooks's law: Adding more resources to a project to increase velocity, when the project is already slowed by coordination overhead
Gold plating: Continuing to work on a task or project well past the point at which extra effort is not adding value

Software engineering[edit]

Software design[edit]

Abstraction inversion: Not exposing implemented functionality required by callers of a function/method/constructor, so that the calling code awkwardly re-implements the same functionality in terms of those calls
Ambiguous viewpoint: Presenting a model (usually Object-oriented analysis and design (OOAD)) without specifying its viewpoint
Big ball of mud: A system with no recognizable structure
Database-as-IPC: Using a database as the message queue for routine interprocess communication where a much more lightweight mechanism would be suitable
Inner-platform effect: A system so customizable as to become a poor replica of the software development platform
Input kludge: Failing to specify and implement the handling of possibly invalid input
Interface bloat: Making an interface so powerful that it is extremely difficult to implement
Magic pushbutton: A form with no dynamic validation or input assistance, such as dropdowns
Race hazard: Failing to see the consequences of events that can sometimes interfere with each other
Stovepipe system: A barely maintainable assemblage of ill-related components

Object-oriented programming[edit]

Anemic domain model: The use of the domain model without any business logic. The domain model's objects cannot guarantee their correctness at any moment, because their validation and mutation logic is placed somewhere outside (most likely in multiple places). Martin Fowler considers this to be an anti-pattern, but some disagree that it is always an anti-pattern.^[7]
Call super: Requiring subclasses to call a superclass's overridden method
Circle–ellipse problem: Subtyping variable-types on the basis of value-subtypes
Circular dependency: Introducing unnecessary direct or indirect mutual dependencies between objects or software modules
Constant interface: Using interfaces to define constants
God object: Concentrating too many functions in a single part of the design (class)
Object cesspool: Reusing objects whose state does not conform to the (possibly implicit) contract for re-use
Object orgy: Failing to properly encapsulate objects permitting unrestricted access to their internals
Poltergeists: Objects whose sole purpose is to pass information to another object
Sequential coupling: A class that requires its methods to be called in a particular order
Singleton Pattern: This design pattern brings coupling and is considered a bad solution
Yo-yo problem: A structure (e.g., of inheritance) that is hard to understand due to excessive fragmentation

Programming[edit]

Accidental complexity: Programming tasks which could be eliminated with better tools (as opposed to essential complexity inherent in the problem being solved)
Action at a distance: Unexpected interaction between widely separated parts of a system
Boat anchor: Retaining a part of a system that no longer has any use
Busy waiting: Consuming CPU while waiting for something to happen, usually by repeated checking instead of messaging
Caching failure: Forgetting to clear a cache that holds a negative result (error) after the error condition has been corrected
Cargo cult programming: Using patterns and methods without understanding why
Coding by exception: Adding new code to handle each special case as it is recognized
Design pattern: The use of patterns has itself been called an anti-pattern, a sign that a system is not employing enough abstraction^[8]
Error hiding: Catching an error message before it can be shown to the user and either showing nothing or showing a meaningless message. This anti-pattern is also named Diaper Pattern. Also can refer to erasing the Stack trace during exception handling, which can hamper debugging.
Hard code: Embedding assumptions about the environment of a system in its implementation
Lasagna code: Programs whose structure consists of too many layers of inheritance
Lava flow: Retaining undesirable (redundant or low-quality) code because removing it is too expensive or has unpredictable consequences^[9]^[10]
Loop-switch sequence: Encoding a set of sequential steps using a switch within a loop statement
Magic numbers: Including unexplained numbers in algorithms
Magic strings: Implementing presumably unlikely input scenarios, such as comparisons with very specific strings, to mask functionality.
Repeating yourself: Writing code which contains repetitive patterns and substrings over again; avoid with once and only once (abstraction principle)
Shooting the messenger: Throwing exceptions from the scope of a plugin or subscriber in response to legitimate input, especially when this causes the outer scope to fail.
Shotgun surgery: Developer adds features to an application codebase which span a multiplicity of implementors or implementations in a single change
Soft code: Storing business logic in configuration files rather than source code^[11]
Spaghetti code: Programs whose structure is barely comprehensible, especially because of misuse of code structures

Methodological[edit]

Copy and paste programming: Copying (and modifying) existing code rather than creating generic solutions
Every fool their own tool: Failing to use proper software development principles when creating tools to facilitate the software development process itself.^[12]^{[original research?]}
Golden hammer: Assuming that a favorite solution is universally applicable (See: Silver bullet)
Invented here: The tendency towards dismissing any innovation or less than trivial solution originating from inside the organization, usually because of lack of confidence in the staff
Not invented here (NIH) syndrome: The tendency towards reinventing the wheel (failing to adopt an existing, adequate solution)
Premature optimization: Coding early-on for perceived efficiency, sacrificing good design, maintainability, and sometimes even real-world efficiency
Programming by permutation (or 'programming by accident', or 'programming by coincidence'): Trying to approach a solution by successively modifying the code to see if it works
Reinventing the square wheel: Failing to adopt an existing solution and instead adopting a custom solution which performs much worse than the existing one
Silver bullet: Assuming that a favorite technical solution can solve a larger process or problem
Tester-driven development: Software projects in which new requirements are specified in bug reports

Configuration management[edit]

Dependency hell: Problems with versions of required products
DLL hell: Inadequate management of dynamic-link libraries (DLLs), specifically on Microsoft Windows
Extension conflict: Problems with different extensions to classic Mac OS attempting to patch the same parts of the operating system
JAR hell: Overutilization of multiple JAR files, usually causing versioning and location problems because of misunderstanding of the Java class loading model