This isn’t a history of interfaces.. It is an overview of the history of designing for interaction. standard disclaimers apply: this was not carefully fact-checked, and it very much represents my personal view of what has been and is now important. Consider these planes (an ancient tool): their designers sought fitness for use, ease of use, good control, long-lasting materials, a good feel in the hand, efficiency of operation, precise adjustment. In use over time, these tools come to be loved by their owners. But most of the qualities we seek have been valued through the ages. When programmable, interactive machines first appeared, the creators of their controls, their interfaces, emphasized the goal of “operating the machine.” 80 columns, to hold 80 characters or numbers paper tape, also encoding characters with holes. A great and still relevant book from the time: Paul Heckel’s Elements of Friendly Software Design. Sutherland’s demo itself is available on the ACM SIGCHI Video compilation for 1983. use the software operate the machine use the software All 39 pages of advertising that Apple bought in a 1984 issue of newsweek are available here: http://www.aci.com.pl/mwichary/computerhistory/ads/macnewsweek the software design manifesto I don’t know that this was a landmark event in the whole industry’s eyes, but Mitch Kapor’s Software Design Manifesto was a clear articulation of the idea that making useful, usable, delightful software is a design problem, not an engineering problem. The same might be said of good software. Here we have the beginnings of a theory of design for software.” live, learn, work, play accomplish a ...
standard disclaimers apply: this was not carefully fact-checked, and it very much represents my personal view of what has been and is now important.. Consider these planes (an ancient tool): their designers sought fitness for use, ease of use, good control, long-lasting materials, a good feel in the hand, efficiency of operation, precise adjustment. In use over time, these tools come to be loved by their owners. But most of the qualities we seek have been valued through the ages. When programmable, interactive machines first appeared, the creators of their controls, their interfaces, emphasized the goal of “operating the machine.” 80 columns, to hold 80 characters or numbers paper tape, also encoding characters with holes. The internal architecture of the machine is exposed in the controls. You can see that the PDP-8 is an octal computer, with its switches in three-bit configurations (it takes three bits to count from 0 to 7, for a total of 8 numbers. Base 8. The TI 980 is a hexadecimal machine, with switches in groups of four. Still, the emphasis is very much “operate the machine.” use the software operate the machine use the software I don’t know that this was a landmark event in the whole industry’s eyes, but Mitch Kapor’s Software Design Manifesto was a clear articulation of the idea that making useful, usable, delightful software is a design problem, not an engineering problem. The same might be said of good software. Here we have the beginnings of a theory of design for software.” live, learn, work, play accomplish a task use the software operate the machine we are used to designing for individuals we’re learning ...
ware development through the prob-lem it addresses and the way in which it addresses the problem.http://www.jimhighsmith.com/articles/IEEEArticle2Final.pdf. Here, we describe the effects of working in an agile style. AGILE RECAPPED Over recent decades, while market forces, systems requirements, implemen-tation technology, and project staff were changing at a steadily increasing rate, a different development style showed its advantages over the traditional one. This agile style of development directly ad-dresses the problems of rapid change. • reduce the elapsed time between making a decision to seeing the con-sequences of that decision. To reduce the cost of moving infor-mation between people, the agile team works to • improve the team’s amicability—its sense of community and morale—so that people are more inclined to relay valuable information quickly. and skills of individuals and molds process to specific people and teams, not the other way around. AGILE IS FOR PEOPLE The user experts, seeing the growing software in its earliest stages, learn both what the developers misunderstood and also which of their requests do not work as well in practice as they had thought. The term agile, coined by a group of people experienced in developing software this way, has two distinct connotations. Too often, software engineering and rigorous process adherents confuse process and competence. When you look under the cover of XP, Scrum, Adaptive Software Development, Crystal Methods, Feature-Driven De-velopment (FDD), or Dynamic Systems Development Methodology (DSDM), the emphasis on people and their talent, skill, and knowledge becomes evident. A recent book by Pete McBreen, ...
When appropriately applied, lean thinking is a well-understood and well-tested platform upon which to build agile software development practices.http://www.poppendieck.com/papers/LeanThinking.pdf. In the mid 1990’s, basic eBay software capabilities were developed by responding daily to customer requests for improvements.5 Customers would send an e-mail to Pierre Omidyar with a suggestion and he would implement the idea on the site that night. Digital River invented the software download market in the mid 1990’s by focusing on ‘lean’ software delivery. Mechanisms were put in place to dramatically shorten the time from problem recognition to software solution. Once speed becomes a value, a paradigm shift has to take place, changing software development practices from the mass production paradigm to lean thinking. Let’s say you are developing order tracking software. Extreme Programming (XP) is a set of practices which focuses on rapid software development. A good knowledge of the domain coupled with short build cycles and automated testing constitute the proper way for software developers to “Do It Right the First Time”. It is sometimes thought that a benefit of good software engineering is to allow low skilled programmers to produce code while a few high skilled architects and designers do the critical thinking. Similarly in software development, the key to rapid delivery is to divide the problem into small batches (increments) pulled by a customer story and customer test. One of the biggest sub-optimizing measurements in software development occurs when project managers are measured on earned value. Standard software contracts and supplier management practices ...
Less than 20 % of software development projects of large organisations succeed; that is, they were delivered in time and in budget; according to Standish Group’s CHAOS reports [3.http://www.compaid.com/caiinternet/ezine/forselius-characteristics.pdf.]. Keywords: project types, software development, portfolio management Background Information and communication technology (ICT) has become more and more ubiquitous in the modern world. The software supplier, i.e. the project organisation, can’t see the danger this poses to program success, even when they should. The practice has proven that, for example, software package configuration needs to be managed differently than customer specific software development. Software product new development project 3. 1. Customer specific new development project Is a project to create a completely new customer specific software. 2. Software product new development project Is a project to create a new software product. A software product is always developed to be used by more than one customer. A software product may be either an independent packaged software or embedded part of any other product. 3. Software version enhancement project Is a project to create a new version of an existing software. The existing software may be either customer specific software or a software product. 5. Package software configuration project Is a project where the result is an installed, parameterized and, user configured software package. 7. Software integration development project Is a project to create software that provides interfaces services between two or more information systems. We can talk about Packaged Software programs when the most important and visible result ...
As you enter the Houston headquarters of BMC Software and proceed across a peaceful, zen-like courtyard, you notice something that seems out of place in this manicured setting – a dozen cruiser bikes are scattered in front of the building.http://www.rallydev.com/documents/Case_Study_BMC10.pdf. They provide a practical and simple solution to getting around on a large campus, and they are also the first indication that there is something a little different going on here. Delivering Faster with Higher Quality than Previously Possible Sure, agile development works well for small teams. But what happens when you apply agile practices to a program that involves 300+ developers and testers spread from India to Houston to Israel? In less than a year, with the help of coaching services and agile lifecycle management applications from Rally Software Development, BMC Software’s Infrastructure Management Group (IMG) transformed their development organization using agile development practices to deliver a major product to the market in less time and with higher Enhancing a Successful Product IMG is responsible for the Patrol® product line which monitors the applications, networks and infrastructure of data centers at the largest Fortune 1000 companies. Patrol Express provides agentless monitoring of the performance and availability of servers, applications, storage and network devices. In late 2004, the IMG decided to make an aggressive move to maintain and grow their revenue. The most telling measure of their success is that the organization can not imagine going back to their old way of developing software. Accelerate Successful Adoption with Expert Coaching While the principles ...
A group of women is shocked to hear the beautiful 40-something announce that despite marrying her third husband, she is completely without experience at physical love.http://www.cmcrossroads.com/articles/ahdec03.pdf. After your first implementation steps, you can return here to find yet another idea to implement. This fantastic voyage is broken up on a calendar basis, following my imaginary development shop through a release cycle. They want things, so they ask for them — paying no heed to production schedules or project plans. When customers do trust a vendor they relax about the small stuff and their horizon becomes a lot wider. To get any of them delivered will take massive changes to the existing software. Following the root cause analysis with the rework needed to correct illustrates most of the software development procedures. This will require some extra work for them, since the contractor isn’t using the same version control and build software. This image is archived by the CMO and forwarded to the software publishing team for distribution. The contractor is using an open source software repository, so establishing bi-directional synchronization every night is a relatively straightforward process. When developers register as members of the team for the Early Feature release, the software automatically keeps their system configuration up to date. The offshore development group in India and the local contractor both have to keep up with the changes manually — the systems management software used internally cannot update either site. Frequently, the build management team has to purchase software locally and then FedEx it overseas. The Late Feature Release The ...
The compiler is built on top of the WDC W65CXX assembly language development system
which is included in this package.http://www.westerndesigncenter.com/wdc/datasheets/816cc.pdf.
The assembly language development system consists of a full macro assembler, an
object file linker and an object file librarian. There are also a number of useful
extensions to the ANSI standard which are controlled by compiler switches. The
compiler reads the input file function by function and produces a parse tree for
the entire function using the preprocessor to expand macros. The code generator
then reads the parse tree and generates a list of assembly language instructions
that are written to a temporary file. Input files can be created with the text
editor of your choice, but the file must be straight text and can not contain
any formatting commands such as those produced by a word processor. Because of
this, the compiler by default writes the assembly language source for a C program
to an intermediate file and then automatically starts the assembler. The CCTEMP
environment variable can be used to pass the intermediate assembly language file
to the assembler through a RAM disk. In some programs, you may not want the compiler
to start the assembler automatically. When option -AT is used, it causes the compiler
to include the C source statements as comments in the assembly language source.
It can also search a user-specified sequence of directories for such files, thus
allowing program source files and header files to be contained in different directories.
Most of the compiler options are set up as toggles, which means that they can
be either on or off. If you wish to specify more than one option ...
Model-based design enables the automatic generation of final-build software from models for high-volume automotive embedded systems.http://www.mathworks.com/products/featured/Embedded_Steer_by_Wire_System_Development.pdf. A software engineering framework is needed to support this. This technology is taking hold as an important component within the next evolution of software development. Although the impact on the software engineering process as a whole is understood, it has not been clearly established. For example, formal methods where proofs are used to ensure software correctness are written in a language that only a few experts worldwide truly understand. This is due to the high-volume nature of mass-produced ECUs, which necessitate the use of low-cost, fixed-point microcontroller units and DSPs. Model-based design fits within the context of any process framework, including those characterized in IEEE Software Engineering Standards [2]. IEEE Std. 730 applies to any general-purpose software project. • Other documents including Software Project Management Plan (SPMP) A common way to view a software process is through use of the V diagram, as shown in Figure 1. The software process in this diagram is composed of: Figure 1: V diagram of software process Model-based design places great emphasis on process iterations, early testing, and reuse throughout the development process, making it both unique and powerful. In model-based design, a block diagram or a state diagram model can serve as the system and software requirements, software design, or, with a slight change of perceptions, the source code. Methods and Tools Model-based design methods are employed during the software engineering ...
Conventional software engineering tends to focus on a small part of the software life cycle: the design and implementation of a product.http://www.semdesigns.com/Company/Publications/ICSM97.pdf. The bulk of the lifetime cost is in the maintenance phase, where one must live with the product previously developed. Presently, we have little theory and fewer tools to help us manage the maintenance activity. The average lifetime of software is about 10 years, according to a study [TAM92] of 95 systems drawn from a variety of application domains. We recommend that the software development process should treat the design as the major product, with the implementation (code) being merely a useful byproduct. We then sketch how the design may be incrementally modified by the DMS to produce revised versions of the software. Our intention is to exhibit a system that maintains designs, in an attempt to persuade the software engineering community of the value of our point of view. The change itself and the informal understand of the software maintainers can be used to focus the recovery activity to the crucial part of the design. Organizations with 5 million lines of code often have hundreds of software engineers working on the system every day. Parlanse provides the DMS implementers with efficient support for compiler-managed forking and synchronization of fine-grain parallel processes on (symbolic) data structures, as well as software engineering support such as modules and robust exception management. If we have design capture and modification tools the tasks of the software engineer changes. both describe an approach for porting software by recovering a plausible derivation leading to ...
The design, development, implementation and maintenance of computer systems and software, requiring knowledge of computer operating systems, programming languages and software development.http://www.nheon.org/nh_projects/pathways/ITandMeWorks/ProgrammingStrandOverview.pdf. Programming Certificate This certificate is for students who want to develop the technical expertise for a career in programming, relational database development and/or programmatic application support in the Microsoft Office environment. Web Development Certificate This certificate is for students who want to develop current, key skills for careers in the Internet marketplace. As the World Wide Web continues to grow and impact business, industry, and education, the Web Development Certificate prepares developers, designers and technical administrators for challenges in the ever-evolving world of Internet Technology. IT & ME As a foundation course to learning how to operate a personal computer, students will explore the three major theory topics of - hardware, software, and communication. Using a fully integrated, hands-on approach, students will learn the fundamental elements of the most current version o f Microsoft Office- Word, Excel, Access, and PowerPoint. Students are required to have basic keyboarding skills before taking this course. Recommended for non-computer majors and students needing basic computer skills. IT & ME Works In this course, students will gain knowledge, skills and experience in four career strands; Business Information Studies, Network Systems, Programming, and Multimedia. They will learn the principles of marketing, eCommerce and the challenge of securing on-line transactions; they will use advanced skills to ...
3 people, 1 computer -- integrated Always reduced to this eventually Careful design to allows you enjoy the parallel model as long as possible Careful design and testing allows the integrated phase will go well Point Having a modular design that enables parallel development.http://www.stanford.edu/class/cs108/handouts031/30SoftwareDev2.pdf. Someone should be able to mess with the implementation of module A without interfering with module B too much. Linux How is it that all the people working on Linux are able to work independently? Most software components aren't as separate as gcc is from make (although perhaps they should be!). In the traditional software engineering process, we research what the customers want and what we're going to do. This results in a "Requirements" document that identifies the features and capabilities that we're shooting for. The Requirements document might list core use cases and scenarios, and include 1st-pass screenshots, or those might be merged into the later design steps. Make a basic design with the whole team present. For Bunny World (team project, hard deadline) the design should aim for simplicity and modularity, even if the structure is not that impressive or novel. Verify the class design by thinking through the chronology of messages which will happen for each of the core use cases step by step. Draw a diagram showing a typical arrangement of the main objects for the program. Really simulate your way through your design to see what it needs to handle. Establish a basically sound design, verify as best you can on paper that its going to work against the core use cases, and then get coding. Some issues will not be revealed until you get ...
The course is practical, not theoretical Designed specifically to feed in to your projects (and your future life …) large and powerful mainframes (e.http://www.cl.cam.ac.uk/teaching/2002/SWEngDes/SoftwareEngDesign.pdf.g. IBM 360) made far larger and more complex systems possible why did software projects suffer failures & cost overruns so much more than large civil, structural, aerospace engineering projects? Tractability of software leads users to demand ‘flexibility’ and frequent changes Structure of software can be hard to visualise/model Much hard slog of debugging and testing accumulates at project end, when: The reality of software development has lagged behind the apparent promise of the hardware Most large projects fail - either abandoned, or do not deliver anticipated benefits The same advantages can apply to software as to teaching. Real software construction combines top-down and bottom up. Now a wide range of techniques and tools for both software and hardware, ranging from the general to highly specialised. customers are much more upset by failure of a familiar feature than of a new one otherwise each bug fix will have a ~ 20% probability of reintroducing a problem into set of already tested behaviours reliability of software is relative to a set of inputs. Software engineering tools deal with complexity. Different hazard categories require different failure rates and different levels of investment in varying software engineering techniques 85 THERAC-25 Therac 25 safety mechanisms replaced by software. But then software is where things break ‘Hot spare’ inertial navigation on Ariane 5 failed first! Most research on software costs and methods focuses on this business model. ...
No part of this product or document may be reproduced in any form by any means
without prior written authorization of Sun and its licensors, if any.http://www.sun.com/blueprints/1101/clstrcomplex.pdf.
Sun acknowledges the pioneering efforts of Xerox in researching and developing
the concept of visual or graphical user interfaces for the computer industry.
Sun reconnaît les efforts de pionniers de Xerox pour la recherche et le développement
du concept des interfaces d’utilisation visuelle ou graphique pour l’industrie
de l’informatique. Your understanding of the complex system failures that
can occur in such systems will influence the decision to use a clustered system
and will also help you design a system to handle such failures. Downtime is a
critical problem for an increasing number of computer users. Computers have not
become less reliable, but users now insist on greater degrees of availability.
Computer users want the systems to remain operational while the system administrators
perform system maintenance tasks. Businesses implement clusters for availability
when the potential cost of downtime is greater than the incremental cost of the
cluster. For many businesses, the business processes themselves are as complex
as the computer systems they rely on. An additional cost may be incurred as a
result of the software licensing agreement for any other software. In some cases,
a software vendor may require the purchase of a software license for each node
in the cluster. Software field defect—An inadvertently corrupted executable
file can cause an application to crash. Knowing how the system software detects
and handles error conditions as they occur is important to a ...
This document provides an overview of the more common system development Process Models, used to guide the analysis, design, development, and maintenance of information systems.http://www.ctg.albany.edu/publications/reports/survey_of_sysdev/survey_of_sysdev.pdf. There are many different methods and techniques used to direct the life cycle of a software development project and most real-world models are customized adaptations of the generic models. While each is designed for a specific purpose or reason, most have similar goals and share many common tasks. There are few stable software processes in evidence, and performance can be predicted only by individual rather than organizational capability.” 3 When such projects succeed, it is generally through the heroic efforts of a dedicated team, rather than through repeating the proven methods of an organization with a mature software process. In the absence of an organization-wide software process, repeating results depends entirely on having the same individuals available for the next project. It is attributed with providing the theoretical basis for other Process Models, because it most closely resembles a “generic” model for software development. Also known as programming, this step involves the creation of the system software. As the software is created and added to the developing system, testing is performed to ensure that it is working correctly and efficiently. The goal of external effectiveness testing is to verify that the software is functioning according to system design, and that it is performing all necessary functions or sub-functions. In a variation of this model, the software products which are produced at the end of each step (or series of ...
