They are time-consuming because basic analysis must be performed such as the analysis of Order, Customer, Market, Channel and so on. This type of analysis could be obtained from 'template' models and edited to meet specific requirements. An 'enterprise-wide' model takes one year or more to develop. Subject area models typically take 3-6 months or more. Decision Support models require six months to 1 year to develop Data Warehouse models require a minimum of 1 year to develop It is not unusual for comprehensive modeling projects to cost millions of dollars.
Considerable time is required to just get people together because of busy schedules.
Rather than use that valuable time for doing baseline work, it is more productive to start with existing template models and edit them as a group. We think it is wiser to buy detailed template models, take advantage of the knowledge contained therein and customize only the areas that need to be changed. Seeing far in advance a near-complete approximation of what will be achieved. The way to shorten the process and reduce the costs is to buy sophisticated 'template' data models. ADRM and Business Partners provide consulting services in support of each Data Environment.