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The most limited sense of this business is that of providing access to a particular application program (such as medical billing) using a standard protocol such as HTTP.

The importance of this marketplace is reflected by its size. As of early 2003 , estimates of the United States market range from 1.5 to 4 billion dollars. Clients for ASP services include businesses, government organizations, non-profits, and membership organizations.


PROVIDER TYPES

There are several forms of ASP business. These are:
  • A specialist or '''functional''' ASP delivers a single application, such as credit card payment processing or Timesheet services;

  • A vertical market ASP delivers a solution package for a specific customer type, such as a dental practice;

  • An enterprise ASP delivers broad spectrum solutions;

  • A local ASP delivers Small Business services within a limited area.

  • Volume ASP


Some analysts identify a volume ASP as a fifth type. This is basically a specialist ASP that offers a low cost packaged solution via their own Web site. PayPal was an instance of this type, and their volume was one way to lower the unit cost of each transaction.

In addition to these types of firm, some large multi-line companies (such as IBM ), use ASP concepts as a particular business model that supports some specific customers.


THE ASP MODEL

The application software resides on the vendor's system and is accessed by users through a web browser using HTML or by special purpose client software provided by the vendor. Custom client software can also interface to these systems through XML API s. These API s can also be used where integration with in-house systems is required.

There are a number of advantages to this approach, including:
  • Software integration issues are eliminated from the client site.

  • Software costs for the application are spread over a number of clients.

  • Vendors can build more application experience than the in-house staff.


There are some inherent disadvantages, including:
  • The client must generally accept the application as provided since ASPs can only afford a customized solution for the largest clients.

  • The client may rely on the provider to provide a critical business function, thus limiting their ability to handle that function to that of the provider.

  • Continuing consolidation of ASP providers may cause changes in the type or level of service available.

  • Integration with the client's other systems may be problematic.



EXAMPLES OF ASP APPLICATIONS

In early 2005, a wide range of applications were made available to the public using the ASP Model. There are 'free' and simple applications such as and NetSuite .


HISTORY

In terms of their common goal of enabling customers to Outsource specific computer applications so they can focus on their Core Competencies , ASPs may be regarded as the indirect descendants of the Computer Bureau s of the 1960s and 1970s . In turn, those bureaus were trying to fulfill the vision of computing as a utility, which was first proposed by John McCarthy in a speech at MIT in 1961 .


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