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--- principles:keep_it_simple_stupid [2025-11-18 09:44] – created colequinn8555
+++ principles:keep_it_simple_stupid [2025-11-25 10:53] (current) – old revision restored (2021-10-20 21:09) christian
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-You'll notice that a cure for the currently sick system doesn't lie in the hands with the political system or even a money fix - but in each and all of us who is going to and do vote. Uproot U.S. [[https://Waselplatform.org/blog/index.php?entryid=645292|新潟市中央区 肩こり]] was written specifically to share U.S. citizens about how to do their votes count for stopping our ailing system.
+====== Keep It Simple Stupid (KISS) ======
-It appears that abortions will certainly covered with tax rupees. This has been contrary to the law Acupuncture clinic so far. What other questionable services (sex change operations, botox injections, etc) will taxpayers by on ought to for?
+===== Variations and Alternative Names =====
-Now that healthcare reform is almost reality, you're ready identify details and nonwinners. Overall, I feel the nation can be a loser in this particular one. Big government programs usually be responsible for massive corruption, mind-boggling inefficiencies, and shameful amounts of waste. And then we're providing them with our healthcare to manage to pay for? Yikes! Drilling down into the specifics we obtain the real winners and losers. It is interesting that the uninsured are similarly!
+  * (Rule of) Simplicity
+  * KISS may also mean "Keep it short and simple", "keep it simple and straightforward", "keep it smart and simple", etc. A large amount of variations exists.
-First, it's FREE! No, it's less than good to be true. All you need will be the thoughts and a computer to type those thoughts out. That's it. If you have the above things then you don't have anything stopping you while using the power of there are a few for your Acupuncture clinic.
+**Remarks**: "Stupid" may be interpreted as an adjective or a noun. Compare the two variants "keep it simple and stupid" vs. "keep it simple, stupid!". Despite all these alternative names, the general idea of the KISS principle is always the same.
-I know you that my own predicament getting to afford healthcare for my own family. I expect the best care, but at an easily affordable rate. Whether or not this costs almost $800.00 thirty day period to spend for my family, I wonder what workers, but alternative are usually? Will it be less for that same appropriate? Or will it be an HMO nightmare where I can't get directly onto see a physician for weeks on final part. Will mental health be covered? May it cost me as a clinician with regards to of being paid for your services Supplied? It's already difficult understanding how insurance companies justify what my pay should be, and at such low amounts!!
-For 15 years, fundamental revenue a year would require 1301.1 billion more when compared 2010 revenues for 3,462.8 billion, in which an increase of 160.2%. Using the same three examples the new tax can $5019 for that single, $2296 for the married, and $16,292 for me. Percentage of income would move to 10.1% for your single, essential.6% for the married, and 10 Osteopathic clinic .9% for me.
+===== Context =====
-However, an individual only deadly. Maybe you messed up and also got a low GPA or a low MCAT score. Actually want to the case, there is certainly little chance that you will get into an US medical school, but may get acceptance a new Caribbean school of medicine. If you are considering about studying medicine abroad, at any time apply nevertheless there is a good chance you is certain to get in. But, if you want to study medicine in north america (which I recommend over studying in foreign medical schools), read entirely on.
+  * [[contexts:Object-Oriented Design]]
+  * [[contexts:Architecture]]
+  * [[contexts:User Interface Design]]
+  * [[contexts:Implementation]]
-Ditto to the costs. I really believe each folks will pay more for healthcare associated with this costs. The government again will include their genius for reducing costs. They'll say that amounted to would have skyrocketed without their mediation.
+===== Principle Statement =====
-Why does my cat need end up being vaccinated? For proper cat 新潟市中央区 肩こり, need to have know that vaccines help prepare your cat's health to fend off invasion by disease. Simply by pet is vaccinated, the immune system will power outage to prevent infection or reduce the severity of disease. You can also reduce cat's experience of infected cats or contaminated environments. Some cats get a a mild reaction into a vaccine, even so usually last no beyond what a week.
+A simple solution is better than a complex one, even if the solution looks stupid.
-Sure, many ladies say they want that guys acted much more a good guy in a captivating comedy. But the truth is, if the first words you utter with potential date sound such as you borrowed them from the silver screen, you seem to appear insincere or maybe manipulative. Drippy words of love are best saved for true lovers, not guests.
-From the keyword search tool, overture, you'll see thousands or even millions of searches in a particular key term. And when people type that keyword into search search engines like bing or Yahoo guess what comes upwards?
+===== Description =====
-Why so many? And traditional counseling the numbers seem to increasing? Several reasons exposed to mind. One, on average we you live longer. Conditions that used to result in death have become more treatable, extending our lifetimes. With increased longevity will come in chronic pain related to those conditions or just to the fermentation process. Cause for the rise in our pain will be the increase in obesity within United Pronounces. According to the Centers for Disease Control (CDC), as of 2009 only two states had an obesity rate of under 20%: the District of Columbia and Colorado (Centers for Disease Control and Prevention, 2009). The CDC reports that obesity may lead to diseases that may include chronic pain.
+The KISS principle is about striving for simplicity. Modern programming languages, frameworks and APIs have powerful means to create sophisticated solutions for various kinds of problems. Sometimes developers might feel tempted to write "clever" solutions that use all these complex features. The KISS principle states that a solution is better when it uses less inheritance, less polymorphism, fewer classes, etc.
-Why healthcare reform? Its claimed that the cost would be less and would give better services. Can estimated that the healthcare bill will cost trillions. A person first look in the overall picture you is able to see that it is not financially sustainable. Might have to fund hundreds of dollars before it begins to pay for your healthcare. Government is inefficient in everything it seriously does. Private Enterprise does a more beneficial job.
+A solution that follows the KISS principle might look boring or even "stupid" but simple and understandable. The KISS principle states that there is no value in a solution being "clever" but being easily understandable.
+This does not mean that features like inheritance and polymorphism should not be used at all. Rather they should only be used when they are necessary or there is some substantial advantage.
+===== Rationale =====
+A simpler solution is better than a complex one because simple solutions are easier to maintain. This includes increased readability, understandability, and changeability. Furthermore, writing simple code is less error-prone.
+The advantage of simplicity is even more significant when the person who maintains the software is not the one who once wrote it. The maintainer might also be less familiar with sophisticated programming language features. So simple and stupid programs are easier to maintain because the maintainer needs less time to understand them and is less likely to introduce further defects.
+One reason to create more complex code is to make it more flexible to accommodate further requirements. But one cannot know how to make it flexible or if that flexibility will be ever needed.
+"When you make your code more flexible or sophisticated than it needs to be, you over-engineer it. Some do this because they believe they know their system's future requirements. The reason that it's best to make a design more flexible or sophisticated today is to accommodate the needs of tomorrow. That sounds reasonable, if you happen to be a psychic." - Refactoring To Patterns - Joshua Kerievsky.
+Another reason to create more complex code is to make optimizations. An optimized code is a more complex code. Pareto principle applies also in code: a program spends most of the time in a small portion of the code, so it will be wise to concentrate the effort to optimize only that part of the code. Another best practice is to follow the
+"Three rules of optimization": (1. Don't, 2. Don't... Yet, 3. Profile before optimizing), which make sense: to optimize only the code with performance problems. (First author: Michael A. Jackson)
+===== Strategies =====
+This is a very general principle, so there is a large variety of possible strategies to adhere more to this principle largely depending on the given design problem:
+  * Avoid inheritance, polymorphism, dynamic binding and other complicated OOP concepts. Use delegation and simple if-constructs instead.
+  * Avoid low-level optimization of algorithms, especially when involving Assembler, bit-operations, and pointers. Slower implementations will work just fine.
+  * Use simple brute-force solutions instead of complicated algorithms. Slower algorithms will work in the first place.
+  * Avoid numerous classes and methods as well as large code blocks (see [[More Is More Complex]])
+  * For slightly unrelated but rather small pieces of functionality use private methods instead of an additional class.
+  * Avoid general solutions needing parameterization. A specific solution will suffice.
+  * ...
+===== Caveats =====
+See section [[#contrary principles]].
+===== Origin =====
+The principle was coined by the American engineer Kelly Johnson referring to the requirement that a military aircraft should be repairable with a limited set of tools under combat conditions ((Ben R. Rich: //[[http://www.nap.edu/html/biomems/cjohnson.pdf|Clarence Leonard (Kelly) Johnson 1910—1990: A Biographical Memoir]]//)).
+The principle of striving for simple solutions sometimes is also called "(rule of) simplicity"((Eric S. Raymond: //[[http://www.catb.org/~esr/writings/taoup/html/ch01s06.html#id2877917|The Art of Unix Programming]]//)) which was also prominently stated by Tony Hoare in his Turing Award lecture: "I conclude that there are two ways of constructing a software design: One way is to make it so simple that there are obviously no deficiencies and the other way is to make it so complicated that there are no obvious deficiencies. The first method is far more difficult."((Tony Hoare: //[[http://awards.acm.org/images/awards/140/articles/4622167.pdf|The Emperor’s Old Clothes / The 1980 ACM Turing Award Lecture]]//))
+===== Evidence =====
+/* Comment out what is not applicable and explain the rest: */
+/*  * [[wiki:Proposed]]*/
+/*  * [[wiki:Questioned]]*/
+[[wiki:Accepted]]: This principle is widely known and accepted in practice. See for example Jargon File: //[[http://www.catb.org/jargon/html/K/KISS-Principle.html|KISS Principle]]//
+[[wiki:Examined]]: While the preference for simple solutions can be considered trivially intuitive, there has been some work relating simplicity or rather complexity and certain quality attributes. But as there is no universally applicable complexity metric and not even a commonly agreed upon clear definition of simplicity, research is bound to examine certain aspects of KISS independently.
+The following hypotheses can be stated:
+  - Simpler solutions are faster to implement.
+  - Simpler solutions yield fewer implementation faults (which reduces testing effort).
+  - Simpler solutions are easier to maintain, i.e. detecting and correcting defects is more effective and efficient.
+  - Simpler solutions yield more reliable software, i.e. fewer defects show up after releasing the software.
+All these hypotheses can be examined with respect to different complexity metrics.
+Hypothesis 1 is true by definition. If the solution cannot be implemented quickly, it is not simple.
+Though hypotheses 2 and 3 are not true by definition but they can be regarded intuitively clear. Nevertheless, there is some research. In ((Virginia R. Gibson and James A. Senn: //[[http://dl.acm.org/citation.cfm?id=62073|System Structure and Software Maintenance Performance]]//)) a system was improved in two steps resulting in three variants of the same system. Several metrics show that the improvements reduced complexity. 36 programmers with varying experience conducted three different maintenance tasks and their performance was measured. The results indicate that the improvements also improved maintainability. Several other studies support the correlation between complexity and maintainability((Chris F. Kemerer: //[[http://link.springer.com/article/10.1007%2FBF02249043?LI=true|Software complexity and software maintenance: A survey of empirical research]]//)).
+Furthermore, software cost estimation techniques are partly based on complexity judgments((Barry W. Boehm: //Software Engineering Economics//, IEEE)). So complexity---although this normally relates the complexity of the problem and not to the complexity of the solution---is a known cost factor which may be accounted to maintenance.
+Lastly, hypothesis 4 is likely to be false. Several studies relating complexity metrics and post-release reliability show that module size in lines of code predicts reliability at least as good as the McCabe metric (also called cyclomatic complexity) ((see Albert Endres, Dieter Rombach: //A Handbook of Software and Systems Engineering//, p. 168ff.)). Assuming cyclomatic complexity correctly depicts the complexity of a module, reliability should not the reason for applying KISS.
+===== Relations to Other Principles =====
+==== Generalizations ====
+==== Specializations ====
+  * [[More Is More Complex]] (MIMC): KISS states that one should strive for simplicity. MIMC makes this more concrete stating that more of anything (methods, classes, lines of code, ...) increases complexity.
+  * [[You Ain't Gonna Need It]] (YAGNI)
+  * [[Rule of Parsimony]]
+  * [[Rule of Robustness]]
+==== Contrary Principles ====
+Note that many principles are contrary to KISS. This means that it is worthwhile to consider KISS when considering one of those. Nevertheless this does not mean that this is true the other way around. When considering KISS, one wouldn't want to consider all principles that have complexity as a disadvantage. So here are those needing consideration:
+  * **[[Generalization Principle]] (GP)**: This is the directly converse principle. A generally applicable solution typically is not simple anymore.
+  * **[[Murphy's Law]] (ML)**: The ultimate reason behind KISS is to increase maintainability and reduce the introduction of defects. But following KISS blindly by always using the simplest solution may also lead to //reduced// maintainability when Murphy's Law is not considered.
+  * [[Model Principle]] (MP): There are often simpler ways to build a software system than to model and mirror the real-world behavior, which frequently means having more objects and more complicated structures. Nevertheless, it is advisable to do so anyway.
+==== Complementary Principles ====
+==== Principle Collections ====
+{{page>collections:OOD Principle Language#Box}}
+{{page>collections:Unix Philosophy (Eric S. Raymond)#Box}}
+===== Examples =====
+==== Example 1: Fuzzy Simplicity ====
+Simplicity is a blurry, partly subjective measure. Sometimes it is difficult to tell what is simpler. The following example shows that:
+<code java>
+public String weekday1(int dayOfWeek)
+{
+    switch (dayOfWeek)
+    {
+        case 1: return "Monday";
+        case 2: return "Tuesday";
+        case 3: return "Wednesday";
+        case 4: return "Thursday";
+        case 5: return "Friday";
+        case 6: return "Saturday";
+        case 7: return "Sunday";
+        default: throw new IllegalArgumentException("dayOfWeek must be in range 1..7");
+    }
+}
+public String weekday2(int dayOfWeek)
+{
+    if ((dayOfWeek < 1) || (dayOfWeek > 7))
+        throw new IllegalArgumentException("dayOfWeek must be in range 1..7");
+    final String[] weekdays = {
+        "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"};
+    return weekdays[dayOfWeek-1];
+}
+</code>
+Both methods do exactly the same thing. They return a string representing the weekday. Just the implementation is different. Both versions may be seen as simpler than the other depending on the view taken. ''weekday2'' has less statements and less execution branches. Complexity metrics measuring these aspects (e.g. the [[glossary:cyclomatic complexity]]) will therefore prefer ''weekday2''.
+On the other hand ''weekdays1'' uses less language features (just switch, return, and exceptions whereas ''weekdays2'' needs if, arrays, arithmetic, return, and exceptions). Furthermore in ''weekdays1'' the relation between input and output can be seen directly and it's clear how it works by just seeing the method. But for understanding ''weekday2'' there are more details to think about. This is especially true for the range check at the beginning and the index computation in the ''return'' statement. Clearly this is not particularly difficult but these are aspects which are more difficult than in the other version of the method.
+So it's not objectively clear which of the two implementations KISS prefers without saying which complexity metric to apply. But this ambiguity is not a problem since principles are not meant to be unambiguous and objective. Eventually a human developer has to decide which solution to implement and the principles only give guidelines.
+===== Description Status =====
+/* Choose one of the following and comment out the rest: */
+/*[[wiki:Stub]]*/
+[[wiki:Incomplete]]
+/*[[wiki:Complete]]*/
+===== Further Reading =====
+  * [[wiki>KeepItSimple]]
+  * [[wp>KISS principle]]
+  * [[http://people.apache.org/~fhanik/kiss.html|Apache: KISS]]
+  * [[http://www.catb.org/~esr/writings/taoup/html/ch01s06.html#id2877917|The Art of Unix Programming: Rule of Simplicity]]
+===== Discussion =====
+Discuss this wiki article and the principle on the corresponding [[talk:principles:Keep It Simple Stupid|talk page]].