Software as a Service (SaaS) is best visualised as sitting at the top of a three-tier Cloud computing pyramid that also comprises PaaS (Platform as a Service) in the middle and IaaS (Infrastructure as a Service), at the bottom. The amount of customer control over the virtualised IT resources increases as you descend the pyramid.SaaS is a software distribution model in which applications are hosted by a vendor or third party service provider and made available to customers over a network, typically the Internet. SaaS is often referred to as software on demand, and the simplest interpretation is that this is software you rent, rather than buy. Popular payment models include subscriptions, annual and perpetual licences, rentals or payments after use. The Evolution of SaasSaaS has grown significantly within the last few years due to both consumers’ and businesses’ accelerating demand for quick, affordable access to online applications that previously they were either financially or physically disbarred from. That dynamism is only set to continue with users becoming ever more mobile and vendors pushing on towards more cloud-native applications; and so relegating ‘cloudified’ client/service architectures and promoting instead new levels of enterprise automation with its ability to support more agile, connected business activities.Why Should Organisations Consider Saas?With its ability to offer affordable, scalable and instant access to a huge range of enterprise software, SaaS can:Allow organisations to invest in enabling applications without upfront capitalUnderpin rapid implementation through cloud deployment modelSignificantly reduce time to benefit through fast provisioningPlan and forecast with greater certainty due to predictable pay as you go modelRemove the need for internal resourcing, support and management of on-premise softwareEncourage more positive adoption and greater returns thanks to frequently lower learning curves associated with browser accessFacilitate customisation, integration and connectivity between systems through freely available APIsCreate a more mobile and productive workforce thanks to SaaS’s ‘work anywhere’ characteristicsLevel the playing field for smaller organisations who can now take advantage of enterprise applicationsDrive down Total Cost of Ownership (TCO)The Benefits of SaasFeatureBenefitAvailability, affordability, accessibilityEnsures software options can be kept more easily aligned with operational needsNo CAPEX requiredPay as you go model removes barriers to implementation and underpins agility and responsivenessScalable commodityFlexes in perfect alignment with user demandPredictable OPEXCost certainty aids cashflow, budgeting and planningPerennial refreshUsers always have access to the very latest versionRapid provisioningImproved time to benefit even with complex systemsDerisked developmentEasier trialling and proof of conceptOutsourced responsibilitySecurity, upgrades and support divested to vendor
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