Differences

This shows you the differences between two versions of the page.

--- principles:keep_it_simple_stupid [2025-11-04 21:06] – created veronicamcnally
+++ principles:keep_it_simple_stupid [2025-11-25 10:53] (current) – old revision restored (2021-10-20 21:09) christian
@@ Line 1: / Line 1: @@
-I was debating healthcare with among the my liberal friends and this dawned on me, the two of us has a hint as about what the bill really represents. Like our congressmen, we have not read it or seen it. We merely know the talking points we hear from both industrys. There are some real questions that should be answered. This is the list of mine.
+====== Keep It Simple Stupid (KISS) ======
-I may go on additionally, on. But, the point we have found that are generally options. Tend to be many far better, more effective and safer alternatives in our current healthcare system. State that Osteopathic clinic are far cheaper, as well.
+===== Variations and Alternative Names =====
-We now know this was a tragedy for nearly everyone, apart from the financial services industry it invented. Individuals didn't save money or get the right financial merchandise. Many were in cash, which generally doesn't Osteopathic clinic cultivate with inflation. As a result, employers are getting more involved requiring people to opt regarding a 401k rather than opting in, choosing a target date mutual fund account as being a default instead of cash, and spending resources on educating their workers more about financial planning.
+  * (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.
-With all of the debate raging about our healthcare crisis in America we have to do a chill pill. Each and every have an emergency of [[https://iasb.com/sso/login/?userToken=Token&returnURL=https%3A//sada--color-maki3-net.translate.goog%2Fbbs%2Fbbs.cgi%3Fpage%3D0%26_x_tr_sch%3Dhttp%26_x_tr_sl%3Dauto%26_x_tr_tl%3Dfr%26_x_tr_hl%|新潟市中央区 坐骨神経痛]]; we have a crisis within the cost and coverage of healthcare. I do not think anyone disagrees that runners should have coverage for anyone in the united states. But there is something badly wrong along with a plan that is now before Congress that 'saves' everything money and increases of the those on Medicaid these days. That's just a red flag in terms of where these Bozo's in DC are leading anyone.
+**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.
-When you are younger in addition to teacher in class asks a person are and your classmates need to resemble when you grow up, you would notice how many of other people say they will want to get a healthcare professional. Maybe you experienced that same dream, a bit too. You know very well that medicine is a field that you enter simply with the right mixture of intelligence and passion. May be a complicated industry, where people's lives are at stake all the time.
-Take a program or home-study the local language. When you are getting there, show interest in learning and understanding more words as well as the values held rather than expecting others to cater to your wants and demands. You are the guests, so be an appreciative wedding guest. Every place has a regarding customs and values possibly very unique from yours. Remember to learn these ahead associated with your or while visiting and engaging the area people. This can vary from how to be seen to being photographed. Never assume. Be open and inquiring.
+===== Context =====
-When ever I visit Henry Su in his Acupuncture clinic 'Good Health Acupuncture & Chinese Herbal Clinic' here in Wellington, I let him insert acupuncture needles into my your body. Henry will check my pulse and look at my tongue and thus able identify how much my is out of balance. Homeopathy based on balance in body, which of course means what ever the body parts may be missing, Chinese acupuncture and herbs bring back the check and give the body to obtain back in order.
+  * [[contexts:Object-Oriented Design]]
+  * [[contexts:Architecture]]
+  * [[contexts:User Interface Design]]
+  * [[contexts:Implementation]]
-They monitor the performance of a hospital or surgery, as well as its possible observe at auto insurance how well the hospital or surgical procedures are doing. There might be the surplus of nurses, or the department may have come to an end of beds, or need other Acupuncture clinic finances.
+===== Principle Statement =====
-I am ashamed at the behavior of some of my conservative brethren. Their insensitivity into the uninsured sick is beyond imagination. Attempt not to miss the conservative steer. The issue is not just about money, we question the assumption that this bill is getting ready to save normal lives. Health insurance is no guarantee of quality healthcare. I am not giddy about this heathcare twist.
+A simple solution is better than a complex one, even if the solution looks stupid.
-The situation is different for together with extensive problems. Even if they can achieve a 60 percent discount, they still not be able to pay a hospital bill of $20,000. So, as they case, a reduction healthcare plan's pretty much useless. But what if a is experiencing a condition that is under suppression? If they could limit their doctor visits to every couple of months, thus chose a provider has been cheap start off with, as high as plan could still be of help. Also remember that these plans extend to prescription drugs. When applied in this manner, drug treatments can cost the same amount as if a person had been insured. For some individuals, this factor alone will make the discount plan worthwhile.
-Rep. James Clyburn said this week he was "giddy" this report by way of the CBO. The bean counters said large healthcare bill will cost just in a trillion dollars and lessen deficit likewise. That's like saying you saved the family money by buying a dress on great deals.
+===== Description =====
-Different staff and departments need different sorts of has reported. A healthcare reporting system can produce reports for how many of staff in, or needed from a department, what resources are important where planet hospital, properly course, financial statements.
+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.
+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]].