Tooling that helps you to design UI that can adapt to different screen resolutions. For instance, the pilot of an airplane needs to converse with the ATC personnel frequently. In receiving antenna is quite opposite because it allows radio signals from the space & changes them into electrical signals & provides them to a transmission line. The ratio of EMF at the receiver input to the intensity of the electric field that occurred on the antenna is known as the receivers effective length. There is a Windows Runtime language projection into C#, into Visual Basic, into standard C++, into JavaScript, and so on. Note: On 23 April 2013, the reference to the "Additional XML Security URIs" Various how-to and overview documentation guides are commonly found specific to the software application or software product being documented by API writers. Yagi antennas can be made by using an antenna with one reflector, a driven folded-dipole active element, and directors, mounted for horizontal polarization in the forward direction. "[9] It should honestly and clearly explain the costs of whatever solution it offers as best. In this modern era of wireless communication, many engineers are showing interest to do specialization in communication fields, but this requires basic knowledge of fundamental communication concepts such as types of antennas, electromagnetic radiation, and various phenomena related to propagation, etc. Loop antennas share similar characteristics with both dipole and monopole antennas because they are simple and easy to construct. Polarization: An electromagnetic wave launched from an antenna may be polarized vertically and horizontally. Includes relations to an environment and construction principles to be used in design of software components. For any help regarding this article, contact us by commenting in the comment section below. The designs of different antennas generate dissimilar radiation patterns and their complexity mainly depends on the design of an antenna. This type of antenna is inexpensive and effective. Windows Forms, WPF, .NET, and managed languages brought their own way of writing Windows apps, and their own flavor of API technology. The antennas operating at microwave frequencies are known as microwave antennas. This situation is particularly prevalent in agile software development because these methodologies try to avoid any unnecessary activities that do not directly bring value. The parabolic reflector antenna is also called a dish antenna. Loop antennas are available in different shapes like circular, elliptical, rectangular, etc. In many applications of antennas, antennas are associated with some basic parameters. 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Today, a lot of high-end applications are seen in the fields of power, energy, transportation, networks, aerospace, safety, security, industry automation, and a variety of other domains. Herbsleb, James D. and Moitra, Dependra. This API is implemented in C++ and is supported in C#, Visual Basic, C++, and JavaScript. Extension SDKs let you call specialized APIs for different devices. Polar Diagram: The most significant property of an antenna is its radiation pattern or polar diagram. It is also very important to update the documents as any change occurs in the database as well. Elucidative Programming is the result of practical applications of Literate Programming in real programming contexts. the photo and video buttons are too close together and too close to the shutter button causing the video mode to be started when I dont want to. The licence mentioned above the download button is just an indication. It has largely replaced interfaces such as serial ports and parallel ports, and has become commonplace on a wide range of devices.Examples of peripherals that are connected via USB include computer keyboards and A UWP app written in C++/WinRT has access to the Win32 APIs that are part of the UWP. Till now we have covered the properties of antennas, and now we will discuss different types of antennas that are used for different applications. Typical antenna parameters are bandwidth, gain, radiation pattern, polarization, impedance & beamwidth. A Planar Inverted-F Antenna can be considered as a type of linear Inverted F antenna (IFA) in which the wire radiating element is replaced by a plate to increase the bandwidth. UWP is one of many ways to create client applications for Windows. The bow-tie antenna is a planar, and therefore, a directional antenna. using word processing applications and spreadsheet applications). UWP apps use WinRT APIs to provide powerful UI and advanced asynchronous features that are ideal for internet-connected devices. Such annotations are usually part of several software development activities, such as code walks and porting, where third party source code is analysed in a functional way. The antenna that comprises one or more dipole elements placed in front of a corner reflector, is known as a corner-reflector antenna. You can submit your app to the store and make it available to all types of devices, or only those you choose. Biconical antenna is an omnidirectional wide-band antenna. When you use the R program it issues a prompt when it expects input commands. Abstract. The designing of field patterns can be done like a function of different fields. To manage the increased complexity and changing nature of requirements documentation (and software documentation in general), database-centric systems and special-purpose requirements management tools are advocated. In the OSI reference model, the communications between a computing system are split into seven different abstraction layers: Physical, Data Link, Network, Transport, These antennas provide different services like rectangular type serves nearby regions, whereas the circular type is used for the communications of inter BTS. UWP apps integrate with Application Insights for detailed telemetry and analyticsa crucial tool for understanding your users and improving your apps. Sometimes, these are called like characteristics or properties of the antenna. They provide high gain in both horizontal and vertical states. Requirements may be implicit and hard to uncover. An interior designer is someone who plans, researches, coordinates, and manages such enhancement projects. There are a number of ways to make money with your app. History. They are widely used in communication links with a frequency of around 3 GHz. UWP is an application model built on top of the Windows Runtime. G = (power radiated by an antenna)/(power radiated by reference antenna). According to the size of this antenna, it has low- frequency response and acts as a high-pass filter. 1.5 Using R interactively. The power received by the antenna gets associated with the collective area. In the case of user documentation, the process as it commonly occurs in industry consists of five steps:[4], "The resistance to documentation among developers is well known and needs no emphasis. These are available in different sizes as well as shapes. Adaptive scaling adjusts to resolution and DPI differences across devices. This makes it much easier to keep the documentation up-to-date. For example: Design your workflow using Navigation design basics for UWP apps to accommodate mobile, small-screen, and large-screen devices. The advantage of these antennas is that they can be hidden into the housing of the mobile when compared to different types of antennas like a whip, rod, or helical antennas, etc. A dipole antenna is one of the most straightforward antenna alignments. In the axial mode, the dimensions of the helix are the same compared to its wavelength. In: Prause, Christian R., and Zoya Durdik. To explain the position of this product with respect to other alternatives. The short dipole antenna is made up of two co-linear conductors that are placed end to end, with a small gap between conductors by a feeder. It is perfectly acceptable to state no conclusion, or to conclude that none of the alternatives are sufficiently better than the baseline to warrant a change. The radiation resistance of small loop antennas can be improved by adding more turns. this is not the case with the Samsung stock camera app. A horn antenna is also called a microwave horn that includes a metal waveguide with flaring & horn-shaped to direct radio signals within a ray. Circular type antennas are mainly used for communication among different BTSs. Directivity and Bandwidth: The directive of an antenna is defined as the measure of concentrated power radiation in a particular direction. See The Fluent Design System for UWP apps for an introduction to Fluent Design. This documentation may be used by developers, testers, and also end-users. Unlike code documents, user documents simply describe how a program is used. See also technical writing. The latest Lifestyle | Daily Life news, tips, opinion and advice from The Sydney Morning Herald covering life and relationships, beauty, fashion, health & wellbeing Bluetooth is a short-range wireless technology standard that is used for exchanging data between fixed and mobile devices over short distances and building personal area networks (PANs). The radiation pattern above the grounded plane will be the same as the half-wave dipole antenna, however, the total power radiated is half that of a dipole; the field gets radiated only in the upper hemisphere region. Its development during the 1990s and 2000s changed the way brands and businesses use technology for marketing. This document specifies XML digital signature processing rules and syntax. Just name the price. Device or software with which the end user directly interacts and that provides the user interface. We are accepting requests for virtual training only. Layout panels help adjust the layout of content based on the size of the screen. It is the simplest of all types of antennas. So, there are several conditions otherwise applications wherever cables are chosen over wireless communication through antennas. If you need to further tailor your UI to a specific screen size or device, new layout panels and tooling help you design UI that can adapt to the different devices and form factors that your app may run on. Sometimes, an electrical device like an antenna or an aerial is used to change electrical power to electromagnetic signals & vice-versa. If the software is a first release that is later built upon, requirements documentation is very helpful when managing the change of the software and verifying that nothing has been broken in the software when it is modified. It also rejects the forming of beam circuits for usual base station antennas to decrease the range of passive intermediation. After that, these signals are processed through a transponder & transmitted back to the earth for reallocation. The App Store Review Guidelines provide guidance and examples across a range of development topics, including user interface design, functionality, content, and the use of specific technologies. This antenna is an open-circuited wire in which short denotes relative to a wavelength so this antenna gives priority to the size of the wire relative to the wavelength of the frequency of operation. The designing of field patterns can be done like a function of different fields. Curriculum-linked learning resources for primary and secondary school teachers and students. They are designed over a logarithmic scale. Resonant loop antennas are relatively large and are directed by the operation of wavelength. These guidelines are designed to help you prepare your apps for the approval process. It should be approached as a scientific endeavor, not as a marketing technique. A unified app store makes your app available on Windows devices such as PC, tablet, Xbox, HoloLens, Surface Hub, and Internet of Things (IoT) devices. Evernote iOS , , . And callable in a way that's very natural to each of those languages. In Agile software development, requirements are often expressed as User Stories with accompanying acceptance criteria. The short dipole antenna is infrequently satisfactory from an efficiency viewpoint because most of the power entering this antenna is dissipated as heat and resistive losses also become gradually high. In a front-fed parabolic dish, the feed can be arranged at the central position of the reflector; however the reflector is an asymmetric section of a paraboloid, thus the focus is arranged to the side. Types of documentation include: Requirements documentation is the description of what a particular software does or shall do. For many applications it is necessary to have some promotional materials to encourage casual observers to spend more time learning about the product. Qt Designer's GUI layout/design functionality is integrated into the IDE, although Qt Designer can still be started as a standalone tool. The major disadvantage of using these antennas is their inefficient and very narrow bandwidth, which is typically a fraction of a percent or, at the most, a few percent. The different types of dipole antennas used as RF antennas include half wave, multiple, folded, non-resonant, and so on. The discone is a type of half-biconical antenna. It can be defined as the range of frequencies over which an antenna can properly radiate energy and receives energy. Other kinds of rounding had to be programmed explicitly; for example, rounding a positive number to the nearest integer could be implemented by adding 0.5 and truncating. Secure: UWP apps declare which device resources and data they access. Zoomed images are very blurry. These Win32 APIs are implemented by all Windows devices. Integrate Cortana to add voice command capability to your app. This would often take the form of a whitepaper. Some options for writing UWP apps include: Check out Get set up to download the tools you need to start creating apps, and then write your first app. Siri is a faster, easier way to do all kinds of useful things, including making calls, sending messages, and more. For example, if your UWP app targets an IoT device, you can add the IoT extension SDK to your project to target features specific to IoT devices. Software documentation is written text or illustration that accompanies computer software or is embedded in the source code. In a transmitting antenna, an antenna receives electrical signals from a transmission line & changes them into radio waves. A Google user. They can be specified as statements in natural language, as drawn figures, as detailed mathematical formulas, and as a combination of them all. That's okay, too. They are designed over a logarithmic scale. In General, the radiation properties of a helical antenna are associated with this specification: the electrical size of the structure, wherein the input impedance is more sensitive to the pitch and wire size. With the proliferation of workplace computers in the early Controls, Input: If non-text content is a control or accepts user input, then it has a name that describes its purpose. For more information about adding extension SDKs, see the Extension SDKs section in Programming with extension SDKs. Common input handling allows you to receive input through touch, a pen, a mouse, a keyboard, or a controller such as a Microsoft Xbox controller. A log-periodic antenna is used in a wide range of applications where variable bandwidth is required along with antenna gain and directivity. The Fluent Design System is a set of UWP features combined with best practices for creating apps that perform beautifully on all types of Windows-powered devices. Code documents are often organized into a reference guide style, allowing a programmer to quickly look up an arbitrary function or class. In software engineering, a software development process is a process of dividing software development work into smaller, parallel, or sequential steps or sub-processes to improve design, product management.It is also known as a software development life cycle (SDLC).The methodology may include the pre-definition of specific deliverables and artifacts that are The purpose of preparing it is to create a common source to be used by all players within the scene. This feature is most important for any kind of antennas used in wireless communications. If you target the universal APIs, then your app can run on all devices that run Windows 10 or later. They are very simple to construct and use. Push notifications that bring real-time alerts to your user's attention. Lay out your user interface to respond to different screen sizes and resolutions. It is also used as an agreement or as the foundation for agreement on what the software will do. When a photo app is running on a desktop computer, the UI should adapt to take advantage of the additional screen space. Digital marketing is the component of marketing that uses the Internet and online based digital technologies such as desktop computers, mobile phones and other digital media and platforms to promote products and services. User documents don't need to be organized in any particular way, but it is very important for them to have a thorough index. Generally, these antennas support all the RF spectrum that is used in different network services like 2G or 3G, or 4G services. The connection of these antennas can be done through waveguides which will end at the BTS and from there, the data can be transmitted to nearby areas suing Outdoor antenna Units or IBS. The effective length of the transmitter can be defined as the length of the free space in a conductor, and current distribution across its length generates the same field intensity in any direction of radiation. Think of the Commons Deed as a user-friendly interface to the Legal Code beneath, although the Deed itself is not a license, and its contents are not part of the Legal Code itself. In the case of wireless communication systems, antennas play a prominent role as they convert the electronic signals into electromagnetic waves efficiently. Helical antennas are also known as helix antennas. Able to use a common API on all devices that run Windows. Windows 10 introduced the Universal Windows Platform (UWP), which provides a common app platform on every device that runs Windows. By using these types of antennas, the feeder connecting the feed horn toward the transmit or receive equipment should be arranged in less distance to reduce losses. Often, software developers need to be able to create and access information that is not going to be part of the source file itself. All you need to do is choose the one that works best for you, for example: There are a variety of ways to keep users engaged with your UWP app: UWP apps use the Windows Runtime, the native API provided by the operating system. This page was last edited on 3 November 2022, at 19:25. The directivity of these antennas becomes double compared to the dipole antennas. The user must acknowledge and authorize that access before the app is granted the capability. It is common to limit provided software documentation for personal computers to online help that give only reference information on commands or menu items. Requirements comes in a variety of styles, notations and formality. Bitcoin transactions are verified by network nodes through cryptography and recorded in a public distributed ledger called a blockchain.The cryptocurrency was invented in 2008 by an unknown person or group of people using the name Satoshi The Windows Runtime is, under the covers, the next stage of COM. The monopole antennas are also used as vehicle-mounted antennas as they provide the required ground plane for the antennas mounted above the earth. Without proper requirements documentation, software changes become more difficult and therefore more error prone (decreased software quality) and time-consuming (expensive). A camera phone is a mobile phone which is able to capture photographs and often record video using one or more built-in digital cameras.It can also send the resulting image wirelessly and conveniently. But if you want your UWP app to take advantage of device-specific APIs, then you can do that, too. more_vert. UWP apps can make use of Win32 APIs and .NET classes (see API Sets for UWP apps, Dlls for UWP apps, and .NET for UWP apps). In the normal mode, the dimensions of the helix are small compared to its wavelength. At the actual application binary interface (ABI) layer, its roots in COM become visible. Technical Documentation of code, algorithms, interfaces, and. To inform them about what exactly the product does, so that their expectations are in line with what they will be receiving. For example, because it is extracted from the source code itself (for example, through comments), the programmer can write it while referring to the code, and use the same tools used to create the source code to make the documentation. The UWP core APIs are the same on all Windows devices. On the satellite, antennas get signals from different sources on Earth. The various types of feeds that use this parabolic reflector include horn feeds, Cartesian feeds, and dipole feeds. This kind of reflector antenna can be fed through the conventional base stations elemental antenna, thus it is equipped through the beam tilting functionalities & radiation with dualpolarization to complete the necessities of adaptive sectorized cell modification. In the antennas radiation pattern diagram, the energy being radiated can be signified through the patterns illustrated in a specific way. The main benefits of these antennas are low SWR (standing wave ratio), moderate directivity, wide bandwidth & easy construction & adjustment. Like other forms of technical documentation, good user documentation benefits from an organized process of development. Universal controls and layout panels help you to optimize your UI for the screen resolution of the device. Fluent experiences adapt and feel natural on devices from tablets to laptops, from PCs to televisions, and on virtual reality devices. In that, arrows signify radiation directions. It works as a flashlight reflector or searchlight to express the radio signals within a narrow ray, otherwise gets radio signals from one specific route only. The variation and complexity of requirements documentation makes it a proven challenge. The Action Center organizes notifications from your app. In mobile communications, this shaped reflector antenna is used as an outdoor base station antenna. It represents a single screen with a user interface. The job of tutoring new users or helping more experienced users get the most out of a program is left to private publishers, who are often given significant assistance by the software developer. Consistency and simplicity are also very valuable. The energy emitted through an antenna can be represented by the antennas radiation pattern. The Microsoft Store provides multiple ways to make money on your app. During this operation, as the frequency varies, a smooth transition takes place along the array of the elements, which leads to forming an active region. But the Windows Runtime was designed to be callable from a great range of different programming languages. Overview. Google Scholar Citations lets you track citations to your publications over time. Before we discuss antenna types, there are a few properties that need to be understood. Consider how you'll accommodate multiple kinds of input. Although the activities work together to form a cohesive user experience in the email app, each one is independent of the others. Partner Center lets you manage and submit all of your apps for Windows devices in one place. A monopole antenna is half of a simple dipole antenna located over a grounded plane as shown in the figure below. Time-Based Media: If non-text content is time-based media, then text alternatives at least provide descriptive identification of the non-text content. A bow-tie antenna is also known as a Biconical antenna or Butterfly antenna. Planning, or the actual documentation phase. Thus, requirements documentation is often incomplete (or non-existent). In a wireless communication system, the antenna is an essential component. These antennas are very simple, cheap, and are used in a wide range of applications. Bitcoin (abbreviation: BTC; sign: ) is a decentralized digital currency that can be transferred on the peer-to-peer bitcoin network. The main benefit of this antenna is that it includes high directivity. Bandwidth is one of the desired parameters to choose an antenna. Your app's user-experience design, however, may need to adapt depending on the device the app is running on. It contains Conceptual, Logical, and Physical Design Elements. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. In addition to interaction on different devices, plan your app to embrace the benefits of working across multiple devices. Electrically small loop antenna> Circumference10, Electrically large loop antenna > Circumference. These antennas can also be used as electromagnetic field probes in microwave bands. You submit and manage all your apps for Windows devices in one place. You can write your app so that you expect it to run only on a particular type of device, and then limit its distribution from the Microsoft Store to just that type of device. If the software is very complex or developed by many people (e.g., mobile phone software), requirements can help to better communicate what to achieve. The situation is different when the modified program is licensed under the terms of the GNU Affero GPL. The term was coined by Darcy DiNucci in 1999 and later popularized by Tim O'Reilly and Dale Dougherty at the first Reusable designs Customize the content in Effective Length: The effective length is the parameter of antennas that characterizes the efficiency of the antennas in transmitting and receiving electromagnetic waves. One of the useful properties of this antenna is the conversion of a diverging spherical wavefront into a parallel wavefront that produces a narrow beam of the antenna. Architecture documentation (also known as software architecture description) is a special type of design document. In addition to interaction on different devices, plan your app to embrace the benefits of working across multiple devices. It could be at the user interface, code, design, or even architectural level. They can be viewed as a folded-dipole antenna and deformed into different shapes like spherical, square, etc., and have similar characteristics such as high-radiation efficiency. In satellite communication, antennas play a key role. If you're curious about that, then this last section is for you. A UPS differs from an auxiliary or emergency power system or standby generator in that it will provide near-instantaneous protection from input power interruptions, by supplying energy It can also be noted as the ratio of the radiation intensity in a given direction to the average radiation intensity. They have relatively simple structures with one, two, or more wires each wound to form a helix, usually backed by a ground plane or shaped reflector and driven by an appropriate feed. low profile antennas are preferred. For example, controls such as buttons and sliders automatically adapt to device screen size and DPI density. So the communication between them can be done through wireless communication & antennas which are the entry for that. A plot can also be obtained for both vertical and horizontal planes and, it is also named as vertical and horizontal patterns, respectively. Types of Antennas used in Satellite Communication. To this end, access to the Windows Runtime is made available via what are known as language projections. These antennas are further classified into two types: electrically small and electrically large based on the circumference of the loop. Documentation is an important part of software engineering. "Architectural design and documentation: Waste in agile development?" 15-1232 Computer User Support Specialists 15-1255 Web and Digital Interface Designers; 15-1290 Miscellaneous Computer Occupations; 15-1299 Computer Occupations, All Other; 15-2000 Mathematical Science Occupations Related Links: May 2021 National Occupational Employment and Wage Estimates. It is difficult to know exactly how much and what kind of documentation is needed and how much can be left to the architecture and design documentation, and it is difficult to know how to document requirements considering the variety of people who shall read and use the documentation. The need for requirements documentation is typically related to the complexity of the product, the impact of the product, and the life expectancy of the software. Design basics introduces you to designing a Universal Windows app. You'll also find detailed analytic reports combined payout details, ways to promote your app and engage with your customers, and much more. Originally, Windows was programmed via flat, C-style Win32 APIs. In: Learn how and when to remove this template message, "RH Earle, MA Rosso, KE Alexander (2015) User preferences of software documentation genres. User experience plays a huge part in determining how happy people will be with your app, so don't skimp on this step. Another type of design document is the comparison document, or trade study. Antennas are designed in such a way that power raises in the wanted direction and decreases in unwanted directions. In a way, architecture documents are third derivative from the code (design document being second derivative, and code documents being first). It is very important for user documents to not be confusing, and for them to be up to date. The designs of different antennas generate dissimilar radiation patterns and their complexity mainly depends on the design of an antenna. Interior design is the art and science of enhancing the interior of a building to achieve a healthier and more aesthetically pleasing environment for the people using the space. As digital platforms became increasingly Background execution and triggers bring your app into action when the user needs it. Word-sense disambiguation (WSD) is the process of identifying which sense of a word is meant in a sentence or other segment of context.In human language processing and cognition, it is usually subconscious/automatic but can often come to conscious attention when ambiguity impairs clarity of communication, given the pervasive polysemy in natural language.In For example, a photo app could adapt its UI when running on a small, handheld device to ensure that usage is ideal for single-handed use. Antenna Gain: The parameter that measures the degree of directivity of the antennas radial pattern is known as gain. Engaging: use live tiles, push notifications, and user activities that interact with Windows Timeline and Cortana's Pick Up Where I Left Off, to engage users. Some would characterize this as a pro rather than a con. The axial mode is used in a wide range of applications. The Microsoft design system is named Fluent. (Refer to Success Criterion 4.1.2 for additional requirements for controls and content that accepts user input.) USB was designed to standardize the connection of peripherals to personal computers, both to communicate with and to supply electric power. User Activities allow users to pick up where they left off in your app, even across devices. See Publish Windows apps and games to learn how to submit your apps for publication in the Microsoft Store. Your app can use voice and Bluetooth LE devices to help users interact with the world around them. Yet it is acknowledged that there are motivational problems in development, and that documentation methods tailored to agile development (e.g. They are designed on logarithmic otherwise usually on a dB scale. An antenna with a higher gain is more effective in its radiation pattern. Videos, games and interactives covering English, maths, history, science and more! These are diagrammatical representations for the radiated energy distribution into space like a function of direction. The Windows Runtime, and WinRT APIs, are an evolution of Windows APIs. Recommended videos See how other users use Prezi Video to engage their audiences. For more introductory material, see An Introduction to Building Windows Apps for Windows 10 Devices. We have suspended in-person training. To excite the potential user about the product and instill in them a desire for becoming more involved with it. Another type of design document is the comparison document, or trade study. In the case of a wire antenna, a conducting sheet is used behind the antenna for directing the radiation in the forward direction. To download the tools you will need to start creating Windows apps, see Install tools for the Windows App SDK, and then write your first app. Architecture/Design Overview of software. Of course, a downside is that only programmers can edit this kind of documentation, and it depends on them to refresh the output (for example, by running a cron job to update the documents nightly). The radiating surface of a parabolic antenna has very large dimensions compared to its wavelength. These are attached to satellites for both transmitting and receiving signals. This collected area of an antenna is known as effective aperture. The field of user experience design is a conceptual design discipline and has its roots in human factors and ergonomics, a field that, since the late 1940s, has focused on the interaction between human users, machines, and the contextual environments to design systems that address the user's experience. The dipole antenna consists of two metallic rods through which current and frequency flow. It focuses on one specific aspect of the system and suggests alternate approaches. These antennas are known as rectangular microstrip antennas or patch antennas; they only require space for the feed line which is normally placed behind the ground plane. The DDD includes the formal information that the people who interact with the database need. Featured Evernote iOS iPhone . Often, tools such as Doxygen, NDoc, Visual Expert, Javadoc, JSDoc, EiffelStudio, Sandcastle, ROBODoc, POD, TwinText, or Universal Report can be used to auto-generate the code documentsthat is, they extract the comments and software contracts, where available, from the source code and create reference manuals in such forms as text or HTML files. Horns are extensively used like antennas at microwave & UHF frequencies over 300 MHz. Requirements are produced and consumed by everyone involved in the production of software, including: end users, customers, project managers, sales, marketing, software architects, usability engineers, interaction designers, developers, and testers. 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