Primarily the discussion revolves around the importance of Cloud Computing, Software-as-a- Service and multi-tenancy… and a little confusion about what each of these terms mean.some may argue that the customer shouldn’t care, as long as the software works as advertised. But that’s too loose of a definition and short-sells some of the operational and reliability implications that may result from certain architectural approaches.though a significant portion of the travel industry isn’t particularly technology savvy (eg. Small Travel agents , Tour and activity operators , bed and breakfast and small inn owners), the choices they make regarding reservation systems, accounting and operations software is vitally important to becoming a profitable operation.
So no matter what size and organization you are or whether you’re a buyer or supplier of travel technology, keep reading.In any solution the architecture matters…a lot. Why?
Especially given the pervasive use of legacy technology in the industry.
Let’s begin with a few definitions that will be helpful in providing context

This is maybe one of the more misunderstood and (sometimes intentionally) mis-used technology-related terms today. Many companies may try to cast their applications as Cloud Computing to cash in on all the hype and confusion. This attempt at mis-direction is called "cloudwashing".
Cloud Computing is the aggregation of leverages a shared Internet-based infrastructure (Infrastructure-as-a-Service or IaaS) with an integrated integration, middleware and development environment (Platform-as-a-Service or PaaS), with the application layer residing on top (Software-as-a-Service or SaaS) represented by the graphic here (source: Christopher Hoff).
Cloud Computing, as defined by the National Institute for Science and Technology, is: On-demand self-service
Broad network access
Rapid elasticity
Cloud Computing is the aggregation of leverages a shared Internet-based infrastructure (Infrastructure-as-a-Service or IaaS) with an integrated integration, middleware and development environment (Platform-as-a-Service or PaaS), with the application layer residing on top (Software-as-a-Service or SaaS) represented by the graphic here (source: Christopher Hoff).
While originally envisioned using a common infrastructure over the public Internet, another variation has emerged called “Private Cloud” promulgated by hardware vendors and traditional hosting providers which leverages a dedicated infrastructure that is either hosted remotely or on servers within an individual company’s premises.
Private Cloud however loses some of the key benefits of the Cloud paradigm, mainly scalability on demand and the ability to eliminate the need for capital expenditures. There may also be negative impacts on disaster recovery and continuity of operations as well. And there is a whole conversation to be had about Public v. Private v. Hybrid Clouds and how they differ from traditional hosted infrastructure, but that’s a whole 'nother post.
Often times it is delivered using a shared infrastructure, a single-code base, classically using a Multi-Tenant architecture where all customers share a common application instance and database – at least from an architectural ‘canon’ perspective, this is the best way to approach it.
key element is also the automatic provisioning of new clients – where they can basically get started right away without manual intervention.
This is similar to automated provisioning in Cloud Computing except we’re dealing with on- boarding customers, not spinning up new hardware to dynamically meet the infrastructure demands that the new customers may require.
SaaS denotes a computing environment where multiple customers access the software application over the Internet.
SaaS also employs a consumption-based model for billing, either via a monthly subscription or a fee-per-transaction model as opposed to the typical software license plus maintenance.
This differs from the Application Service Provider (ASP) model which provides a hosted single- instance of the application and database for each customer.
Some say that Saas and Cloud based are somewhat akin to next gen ASP, but to me that’s like saying Neanderthals are somewhat akin to homo sapiens. The differences are large and important.
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