Once your maintenance activities are defined, you can then proceed to the central part of your analysis: computing maintenance metrics. Maintainability definition: the facility with which something can be maintained | Meaning, pronunciation, translations and examples Relyence Maintainability Prediction allows you to define your maintenance activities by Tasks, Task Groups, or FD&I Outputs. When a system has high maintainability, it is easier to make improvements in the other quality areas, such as fixing a security bug. As a result, we’ll be writing a series of articles to introduce you to some key concepts in reliability and Maintainability.. When evaluating system availability, both types of actions need to be taken into account for accurate metrics. Maintainability is a measure of the difficulty to repair the system. The M(t) curve is a cumulative density function that provides an estimate of the probability of completing an arbitrary system repair action in a given amount of time. Maintainability has two categories: serviceability … Unacceptable downtimes could be caused by a number of issues such as poor repair procedures, inability to correctly isolate a fault, or inefficiencies that cause the repair process to be too cumbersome or difficult to perform. What Is Maintainability? There are many advantages to performing Maintainability Prediction analysis. You can build up a library of these basic tasks and then reuse them within your analysis. Maintainability testing shall use a model of the maintainability requirements of the software/system. To keep in a condition of good repair or efficiency: maintain two cars. In other words, maintainability measures the ease and speed with which a system can be restored to operational status after a failure occurs. Maintainability has two categories: serviceability (the ease of conducting scheduled inspections and servicing) and repairability (the ease of restoring service after a failure).”. Code maintainability is important. The maintainability testing shall be specified in terms of the effort required to effect a change under each of the following four categories: Corrective maintenance – Correcting problems. To keep up or carry on; continue: maintain good relations. Other metrics that can be obtained from Maintainability Prediction MTTR software based on MIL-HDBK-472 include: Relyence Maintainability Prediction supports a wide range of maintenance and repair metrics. Again according to the American Society of Quality, maintainability is defined as “the probability that a given maintenance action for an item under given usage conditions can be performed within a stated time interval when the maintenance is performed under stated conditions using stated procedures and resources.” There is a strong correlation with related key performance indicators and highly reliable plants. Your email address will not be published. Maintainability is the measure of how quickly and easily a product or system can be repaired in order to return to an operating state after a failure has occurred. Another reason why maintainability is a special aspect of software quality is that it acts as an enabler for other quality characteristics. Changes to the hardware, operating system, software dependencies, and organizational business rules and policies are handled in adaptive maintenance. Adaptive maintenance includes the environmental changes where your software is living. So, even though you experienced a system failure, you are able to quickly return your system to an operating state with little impact to your customers. System uptime and availability depend not just on high reliability, but also on an effective maintenance program – one that includes corrective and preventive measures and ensures fast and efficient repair procedures. Again according to the American Society of Quality, maintainability is defined as “The probability that a given maintenance action for an item under given usage conditions can be performed within a stated time interval when the maintenance is performed under stated conditions using stated procedures and resources. Reliable plants are safer plants as well–when reliability metrics go up, safety incident metrics tend to go down. We’ve recently partnered with our friends at the University of Tennessee (Knoxville) Reliability & Maintainability Center to offer reliability & training opportunities in both instructor-led and online formats (more about that below). Maintainability encompasses a range of activities to keep systems up and running. To provide for; support: maintain a family. By providing an organized and efficient approach to analyzing your system maintainability, you gain more insight and can proactively work towards improvement. tains 1. 4. a. For example, you may be able to improve the ability to repair your system by reviewing current practices, or even improve the reliability of your system based on your repair data. Relyence Maintainability Prediction is a browser-based, comprehensive package for performing Maintainability Prediction analysis. As you then move onto future product revisions, you can start with your original analysis and adapt the lessons learned into your next design. Then it shows you how to fix the problem. Software maintenance is a phase in the software development cycle that starts after the customer has received the product. Fresh on the heels of[...]. Top articles, guides, and freebies delivered straight to your inbox. The origins of contemporary reliability engineering can be traced to World War II. The words Maintenance and Maintainability are often used synonymously and that is incorrect. Using MIL-HDBK-472 as a basis, you can calculate a host of metrics for assessment of your system’s repair statistics. In changing circumstances adaptive maintenance is required to keep your software fresh or to increase the lifetime of the software. Again according to the American Society of Quality, maintainability is defined as “The probability that a given maintenance action for an item under given usage conditions can be performed within a stated time interval when the maintenance is performed under stated conditions using stated procedures and resources. In this case, Maintainability Predictions are helpful by allowing you to complete an evaluation of your product prior to manufacture – while design changes that improve repair times are significantly less impactful. This is similar to system reliability analysis except that the random variable of interest in maintainability analysis … When discussing reliability at a plant, reliability is defined as “The probability of a product performing its intended function under stated conditions without failure for a given period of time.” (Thanks to our friends at the American Society of Quality for that reliability definition). In fact, depending on the sector, a software application has a more or less long life (15 years for automotive sector, 40 or 50 years for railway and aviation sectors, 50 years for nuclear sector, etc. Quantifying and tracking maintenance activities is a critical component in ensuring your reliability and quality system goals are attained. Maintainability Prediction is a way to analyze a system to determine repair and maintenance measures, such as MTTR (Mean Time To Repair). Measuring software maintainability is non-trivial and there exists no single metric to measure it accurately. Similar to the way Reliability Prediction evaluates failures, Maintainability Prediction evaluates repairs. ); therefore, the ability to maintain a software application with respect to safety is essential. For these reasons, organizations invest not only in providing high reliability, but also in achieving high availability, which takes into account repair, or maintainability, metrics. Collectively, they affect both the utility and the life-cycle costs of a product or system. This is the first article in the series, and we’re going to keep it basic and foundational by giving a quick and easy definition of reliability and maintainability. The calculations are based on the tasks needed to complete a maintenance activity and their associated times. © 2020 Relyence Corporation All Rights Reserved. To a developer, maintainable code simply means “code that is easy to modify or extend”. Maintainability is an important aspect in overall system continuous improvements efforts, along with reliability, safety, and other factors vital to overall product viability. Maintenance is the act of providing the service of checking, repairing or replacing. ‘Materials, including buff-colored brick, metal panels, glass and steel, create a positive visual impact and enhance the building's maintainability.’ ‘What's more, there are issues related to equipment maintainability, reliability, hardening pattern repeatability, and downtime.’ Dictionary of Military and Associated Terms. You can see how this can be crucial in areas such as keeping military aircraft able to fly, communication networks operating, or life-saving medical devices up and running. Convergence Training and RedVector both offer online training solutions related to reliability and maintainability, and RedVector offers online courses that can be completed as part of the UT-RMC’s Reliability & Maintainability Implementation Certification (RMIC) program. Maintainability is the probability that maintenance of the system will retain the system in, or restore it to, a specified condition within a given time period. Metrics such as Overall Equipment Effectiveness (OEE), Total Effective Equipment Performance (TEEP) or Asset Utilization can be used to assess overall equipment health. A Maintainability Prediction analysis uses mathematical equations to determine maintainability metrics. Keep your eyes on our blog for additional articles on reliability and maintainability and we’ll go into more details and cover things in more depth. Adding new features that deliver value to an organization should be a moment to celebrate rather than fear. 3. You can combine all those Maintenance Tasks into a single Maintenance Task Group to use in your analysis for quick and consistent measurement. In fact, many times the term RAMS (Reliability, Availability, Maintainability, and Safety) or “reliability and maintainability” will be used. The reliability of a plant can be measured using MTBF (mean time between failure) and maintainability can be measured by MTTR (mean time to repair). Download Now Your code comes out smelling like a rose. In this manner, Maintainability Predictions become a key element in your continual improvement process. Performing Maintainability Predictions also enables you to focus on the review of your repair and maintenance procedures. Plus, check out our recorded webinar on maintenance, maintainability, organizational learning, and continuous improvement. The term maintainability corresponds to the ability to update or modify the system under test. Often it is linked to the practice of more preventive and predictive maintenance (and less reactive maintenance). To learn more about this, please read the article below, and of course let us know if you need any assistance with your maintenance, maintainability, or reliability training programs. But do you know the differences between them? Some of the commonly used maintainability engineering terms are shown on maintainability function, M(t), illustrated below. Four Elements of Maintainability Prediction. As a result, we’ll be writing a series of articles to introduce you to some key concepts in reliability and maintainability. The purpose of Reliability and Maintainability (R&M) engineering (Maintainability includes Built-In-Test (BIT)) is to influence system design in order to increase mission capability and availability and decrease … Maintainability is how easy it is for a system to be supported, changed, enhanced, and restructured over time. Save my name, email, and website in this browser for the next time I comment. The maintainability index is calculated as a factored formula consisting of Lines … Maintainability Predictions can help in evaluating all these factors and provide insight to enable you to improve. The discipline’s first concerns were electronic and mechanical components (Ebeling, 2010). maintainability the ability of a product or component to be kept in a state in which it can perform its required function when maintained. The Maintainability is the probability of performing a successful repair or replace using the prescribed practices and procedures for serviceability and reparability. Maintainability; Extensibility; Maintainability. Understanding up front how maintainable software needs to be for a certain project is important, due to its impact on your architecture. Some of the data required to define a Maintenance Group includes the repairable item access (single or multiple items), the replacement philosophy (group or iterative), and if reassembly of the unit is required for checkout. MIL-HDBK-470A is a Department of Defense (DoD) handbook entitled Designing and Developing Maintainable Products and Systems that includes a wealth of information to guide you in designing with maintainability in mind. By these modifications to the environment, changes can occur in the other parts of the software. In addition, you can define a task group, or multiple tasks performed together to complete a repair action, such as “replace motherboard”. It is expressed in terms of hours. MIL-HDBK-472 offers a detailed, analytical approach to assessing your maintenance-related metrics. Maintainability is the measure of how quickly and easily a product or system can be repaired in order to return to an operating state after a failure has occurred. He's worked in training/learning & development for 25 years, in safety and safety training for more than 10, is an OSHA Authorized Outreach Trainer for General Industry OSHA 10 and 30, has completed a General Industry Safety and Health Specialist Certificate from the University of Washington/Pacific Northwest OSHA Education Center and an Instructional Design certification from the Association of Talent Development (ATD), and is a member of the committee creating the upcoming ANSI/ASSP Z490.2 national standard on online environmental, health, and safety training. For example, repair and maintenance related functions may include: While an important aspect of system success depends on the measure of reliability, or the failure profile, of a product, it is equally important to consider the repair, or maintainability, procedures performed. maintainability The ability of an item, under stated conditions of use, to be retained in or restored to a state in which it can perform its required functions, when maintenance is performed under stated conditions and using prescribed procedures and resources. The most commonly used standard for performing Maintainability Predictions is MIL-HDBK-472, titled Maintainability Prediction. There are a number of components in performing a Maintainability Prediction analysis based on MIL-HDBK-472 methodology: Maintenance Tasks, Maintenance Task Groups, FD&I Outputs, and Maintainability Groups. For example, if a system fails but can be repaired quickly, then system uptime, or availability, is high. Maintainability is defined as the probability of performing a successful repair action within a given time. I’m not trying not to be hyperbolic, but it has become increasingly apparent that code maintainability was extremely undervalued by many of the people who wrote the original code for my clients. SonarQube helps you find your Code Smells and understand what’s wrong. Fully implementing MIL-HDBK-472, Relyence Maintainability Prediction offers a host of features to help complete your Maintainability Prediction analyses accurately and efficiently. Availability, reliability, and maintainability are a set of attributes that we often talk about in Maintenance. The central goal is to optimize your repair and maintenance policies and procedures. Extensibility of a system describes how easy it is to incorporate new features into it. The maintainability of a software application is the most important attribute after safety. US Department of Defense 2005. There are also discussions and materials available centering on the idea of Design for Maintainability (DFM). Reliability, maintainability, and availability (RAM) are three system attributes that are of great interest to systems engineers, logisticians, and users. By evaluating all the corrective and preventive maintenance actions across your system, a Maintainability Prediction analysis can provide insight into the activities or components that are causing long system downtimes. Reliability is the wellspring for the other RAM system attributes of availability and maintainability. Availability is the probability that the system is operating satisfactorily at any time, and it depends on the reliability and the maintainability. By improving usability and increasing performance, you can quickly gain an early advantage over sluggish competitors that are still firefighting software bugs of past and present. Maintainability is the ease with which a product can be maintained in order to isolate defects or their cause, correct defects or their cause, meet new requirements, make future maintenance easier, or cope with a changed environment. Maintainability is a multifaceted quality attribute - each of the facets must be analyzed to objectively measure it. For example, if a component of your system fails, but can be repaired quickly, your overall downtime is minimized. This is a very important parameter as the system is subjected to changes throughout the software life cycle. Software maintainability is no longer a nice to have; it’s a necessity. See MAINTENANCE. Reliability & Maintainability (R&M) Engineering Overview. At Relyence, we have a passion for always improving. Maintenance activities can be corrective, meaning they are performed in order to fix a failure, or preventive, meaning they are performed in order to keep your system in good operating condition to avoid a fault. b. Maintainability analysis Maintainability = Productivity. Don’t forget to download the free Guide to Online Maintenance Training below before you go. FD&I Outputs, or Fault Detection and Isolation Outputs, are the activities performed in order to detect and isolate a failed item. A top quartile reliable plant is typically more productive, has more stable processes resulting in higher quality, lower costs, and has a more engaged workforce. It can be especially difficult in the design stage of the product lifecycle to assess repair metrics when actual production has not yet started. Maintainability refers to the ease with which you can repair, improve and understand software code. In many cases, maintainability is a part of continuous improvement objectives. Maintainabilityrefers to the ease with which maintenance activities can be performed on an asset or equipment. Its purpose is to measure the probability that a piece of equipment in a failed state can be restored to normal operating conditions after undergoing maintenance. These differing perspectives on maintainability have always been a cause of immense grief to IT projects. Maintainability is an important aspect in overall system continuous improvements efforts, along with reliability, safety, and other factors vital to overall product viability. Maintenance Groups define how a repair action is performed on a group of items, rather than on a single item. Maintainability Prediction analyses support the ability to define any type of maintenance activity that has an impact on your overall system uptime. Individual MTTR Element Values: The summation of the results associated with Preparation, Fault Isolation, Disassembly, Interchange, Reassembly, Alignment, Checkout, and Start Up. Reliability was first practiced in the early start-up days for the National Aeronautics and Space Administration (NASA) when Robert Lusser, working with Dr. Wernher von Braun's rocketry program, developed what is known as \"Lusser's Law\" . For example, something as basic as “remove screw” may be a basic task. Maintainability Is an Enabler for Other Quality Characteristics. There, I said it. Your email address will not be published. For your systems, the steps required to replace the motherboard will be the same all the time – perhaps opening up a case, removing some screws or clips, swapping the board, and then closing the case back up. For this reason, an important part of assessing your product or system availability must incorporate your repair and maintenance times. Industrial Maintenance Training Solutions, FREE Guide to Selecting Online Maintenance Training, American Society of Quality for that reliability definition, the American Society of Quality, maintainability is defined, UT-RMC’s Reliability & Maintainability Implementation Certification (RMIC) program, Client Testimonial Video: Ring Power & Amanda Anders, Effective EHS Training: A Step-by-Step Guide, Online Safety Training Buyer's Guide Checklist, Online Contractor Orientation Buyers Guide, Learning Management System (LMS) Buyer's Guide. MIL-HDBK-472 has its roots in DoD applications but is the singular standard that has long been in place for optimal maintenance analysis across a broad range of industries worldwide. To keep in an existing state; preserve or retain: maintain one's composure. MTTR (Mean Time To Repair) is the average time needed to repair a failed item. This comprehensive handbook offers mathematical equations to assess the most commonly used repair measures for an accurate overview of your system maintainability profile. Maintainability is all about how easy it is to fix a bug found in the application. Introducing Relyence Maintainability Prediction and Relyence Weibull, Relyence Reliability Block Diagram (RBD): High Performance System Modeling, How to Perform Reliability Predictions Easily and Efficiently, How Your Reliability Tools Can Work Together to Achieve Maximum Results, An Overview of Reliability Analysis Tools and Techniques, Replacing a defective component with a spare, Isolating and replacing the defective parts of a component while being able to keep the working parts, Performing maintenance activities during downtimes to prevent future failures, Replacing components with newer designs to prevent potential failure occurrences, Changing out components with those that are easier to repair or maintain, Replacing components nearing the end of their useful life, MMH/Repair: Mean Maintenance Manhours per Repair, MMH/MA: Mean Maintenance Manhours per Maintenance Action, MMH/OH: Mean Maintenance Manhours per Operating Hour, MaxCMT: Maximum Corrective Maintenance Time, MMH/Repair: Mean Maintenance Hours per Repair, MMH/MA: Mean Maintenance Hours per Maintenance Action, MMH/FH: Mean Maintenance Hours per Flight Hour, MMH/OH: Mean Maintenance Hours per Operating Hour, Isolation to a Single RI: Percent isolation to a single replaceable item, Isolation to a Group of RIs: Percent isolation to a group of replaceable items. You can use this information to optimize your maintenance and repair activities to keep your system up and running with minimal downtime once it is in the field. Extensibility. Maintainability Index (MI) [article cited from Wikipedia] Maintainability Index is a software metric which measures how maintainable (easy to support and change) the source code is. NASA-TM-4628, Recommended Techniques for Effective Maintainability, also delves into the methodologies for designing highly maintainable systems. Maintainability Prediction analysis can also be performed once a system is up and operational. Jeff frequently writes for magazines related to safety, safety training, and training and frequently speaks at conferences on the same issues, including the Washington Governor's Safety and Health Conference, the Oregon Governor's Occupational Safety and Health Conference, the Wisconsin Safety Conference, the MSHA Training Resources Applied to Mining (TRAM) Conference, and others. This impact makes maintainability an important non-functional requirement to consider … Jeffrey Dalto is an Instructional Designer and the Senior Learning & Development Specialist at Convergence Training. Contact us today so we can talk about your MTTR software needs and how Relyence Maintainability Prediction can help, or sign up today for our free trial! Both these concepts are quite deeply related, and are clubbed together under a single umbrella - maintainability. Similar to Maintenance Task Groups, FD&I Outputs are typically defined as a group of tasks performed together as a unit. Maintenance actions are defined by a list of basic Maintenance Tasks that define the procedure for repair or maintenance action. Download this free guide to discover everything you need to know to select and use online maintenance training, including courses, learning management systems, and providers. Just a few of the numerous design considerations are standardization, accessibility, and modularity. This is the first article in the series, and we’re going to keep it basic and foundational by giving a quick and easy definition of reliability and maintainability. What Is Maintainability? When an incident causing downtime occurs, maintainable services can be … Maintainability is a designed-in parameter that should be done when designing a piece of equipment/machine. Replacing the air filters in your HVAC is a preventive action – you do this to avoid a HVAC system failure due to restricted air flow. MTTR and other metrics, such as MCMT (Mean Corrective Maintenance Time) and MPMT (Mean Preventive Maintenance Time), are the most common indictors used in maintainability analysis. For example, modularity addresses the ability for removal and replacement by smaller units (modules) that should be built into the machinery and equipment, including: Plants benefit in many ways from increasing reliability and maintainability. Typically, this analysis is done using a software tool designed for Maintainability Prediction. We need to keep pace with all the new technological innovations, as well as new methodologies in industries. recorded webinar on maintenance, maintainability, organizational learning, and continuous improvement. Once these are in place, you can then go step-by-step through the components in your system and describe the process and procedures required to repair and replace failed items. One of the main advantages of Maintainability Predictions is that they can be performed during the product design stage, enabling you to preview likely maintainability metrics. 2. Clean code means happier developers and higher team velocity. An example corrective action would be replacing a condenser unit in your HVAC system when it fails. Relyence® is a registered trademark of Relyence Corporation. The University of Tennessee Reliability and Maintainability Center (RMC) provides professional development training, assessments, company studies and a University-sanctioned certification based on measurable results (safety, culture, quality, throughput/uptime and cost). That’s the core capability of Maintainability Predictions – providing detailed analysis and measurement of your most vital maintenance actions. In fact, Maintainability Predictions are most useful when used throughout your entire product lifecycle and even into next-gen product development. The lessons learned from your repair and maintenance efforts can be useful in finding ways to continually improve your product. We’re hitting the ground running right out of the gate[...], Reliability Block Diagrams (RBDs) offer a way to graphically depict[...], Our spring release has sprung! Required fields are marked *. We continually work on product development, new capabilities, feature enhancement, and ever improving our tools. It is difficult to achieve this goal without measurable statistics. Also known as availability, reliability, and serviceability – usually for computer-related hardware and software – the three are very different concepts. Along with this basic task, you assign the time it takes to perform the task. You can start your prediction with as much information as you have, get a quick, early assessment, then refine your analysis as your design matures to get a more and more accurate assessment. This article is a collaboration between the University of Tennessee Reliability and Maintainability Center (RMC), Convergence Training, and RedVector. Maintainability Predictions can be used starting from early phase design concept through to manufacturing and production. Maintainability factors into availability by describing how downtime originates and is resolved. 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A passion for always improving is how easy it is linked to the ease with maintenance... The wellspring for the next time I comment an organization should be done when a... To download the free Guide to Online maintenance Training below before you.... Once a system fails, but can be repaired quickly, your overall system uptime for this reason an! Repair the system is up and running certain project is important, due to its impact on your architecture methodologies... Is the act of providing the service of checking, repairing or.... New methodologies in industries aspect of software quality is that it acts as an enabler for quality... Maintenance efforts can be used starting from early phase design concept through to manufacturing and production,... Advantages to performing maintainability Prediction is a measure of the facets must be analyzed to objectively measure it accurately considerations... 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