Why is it important to fix errors as early as possible? It has been well documented in many disciplines that fixing errors in later phases of design can be expensive. The famous architect Frank Lloyd Wright said it best: "You can use an eraser on the drafting table or a sledgehammer on the construction site." In the realm of software development, a general rule of thumb is that errors cost about ten times more effort and money to fix late in the process than if they are caught in an earlier phase. Watts Humphrey and others in the field of software engineering have even documented costs on the order of 100 to 1,000 times more effort and money to fix problems after deployment.
Why does it cost so much to make downstream changes? There are three reasons:
(1) All the deliverables generated in later phases of design have to be made consistent with the proposed changes.
(2) Sometimes one change forces other changes to be made so that everything will work correctly.
(3) Most importantly, anything that causes a change in the software source code and HTML is expensive. Think about the time to change a simple sketch versus the time to rewrite the code that implements the ideas in the sketch.
Suppose you already have a Web site but want to add LOCATION BREAD CRUMBS, tiny markers like "Home > About > History," at the top of each page so that your customers always know where they are in the site. Not only does this change have to be made on every page, but you also have to redesign the overall page layout to accommodate that change. Style sheets and other template mechanisms may make the technical part of this change much easier, but you will still have to make significant design and layout changes so that it all makes sense.
Now this is just a trivial change. Imagine the kind of effort it would take to make more involved changes, such as altering the way information is organized on the site or adding a significant feature that requires new code. Add these costs to what was spent in the first place, and you will see why downstream changes are expensive.
What kinds of mistakes are made on Web sites?. For example, a SHOPPING CART is definitely the right feature for an e-commerce site, but it could have implementation problems that make it hard for customers to check out and finalize purchases. Iterative design and testing will help you discover these types of problems.
Ultimately, you want to be at the top with the right features and the right implementations of those features. Iterative design helps push you toward the top left by getting constant feedback from customers about features and their implementation.
To summarize, design mistakes are costly, and it pays off in the long run to find them as early as possible in the development cycle. This is why rapid iterative design is so important in the early phases: It helps teams find and root out as many problems as possible before the site is deployed.
KITCHEN SUPPLIER UK:supplier of quality kitchens within the uk.
Fitted Kitchens, Kitchen Appliences, Kitchen Worktops, Kitchen Sinks, Kitchen Handles, Kitchen Stools
Football Tickets
Football information on the history of soccer, details on all the great players to have played football throughout the years.
Paket Wisata Murah di bali
Media Informasi Lengkap tentang Wisata Murah ke Bali, hotel & Villa, sewa kendaraan, paket Hemat, Paket outbound / Outing, Paket Bulanmadu / Honeymoon, Paket Meeting, Paket Natal, Paket Lebaran, Paket Tahun Baru, Paket Liburan Sekolah, Paket Liburan ke Lombok, Paket Kunjungan Kerja
Liburan ke Bali
Informasi mengenai liburan ke Bali, akomodasi (villa atau hotel di Bali), voucher hotel murah, tour atau sewa kendaraan, paket liburan murah, dan informasi lainnya yang anda butuhkan selama liburan di Bali.
Batteries
The batteries online mega shop with over 50.000 types of batteries.
|
