There is little, if any, information that can be determined by such a map. WAN Los Angeles Chicago (HQ) Dallas Records Computing Processing FIGURE 3.26 Multiple Requirements Maps Developing the Requirements Specification 151 40 67 45 Servers 14 22 Storage Servers 51 Compute 88 Servers Storage Server 14 60 74 Servers Digital Video Application G Applications E, F Application B Application C Applications A, D South Campus LAN Central Campus LAN North Campus LAN FIGURE 3.27 A Campus Requirements Map 3.12 Developing the Requirements Specification The requirements specification and requirements map are the results of the analysis process. The first part of the process is determining any initial conditions for the project. This includes the type of network project, scope of the project, project goals, and political, administrative, and financial forces acting on the project. Part of the initial conditions of the project may be determining whether the network needs singletier or multitier performance. We would also make a rapid, initial evaluation of the problem(s) in the network, if any, and estimate resources and schedule. Thus, before we have gathered any requirements for the network, we should have some or all of this information documented. Consider the example of a building network from Chapter 2. The first part of the requirements specification may look like Figure 3.28. The second part of the requirements specification comprises the gathered and derived requirements for the network. In this example some requirements were 152 CHAPTER 3 Requirements Analysis: Process Requirements Specification Section 1: Initial Conditions Project Type Upgrade of building network Project Scope Project Goals Other Conditions Single building, two floors, approximately 150 users Improve performance to all users, particularly some missioncritical applications, and increase security to Internet Financial TBD Application performance has been a recurring problem, so management wants to upgrade network and has suggested upgrading interfaces to Fast Ethernet. Some users have GigE interfaces on their workstations. Problem Evaluation and Definition FIGURE 3.28 A Template for Initial Conditions learned in our initial discussion with the customer (management and staff). These requirements are shown in Figure 3.29, using the template from Chapter 2. It is not always the case that requirements can be gathered from early meetings. To get requirements from users, we usually ask them questions about their User distribution is: 60 engineers, 15 HR and Finance, 30 Manufacturing, 10 Management, 30 SalesMarketing, 5 Other Gathered from Management 14Jan01 User TBD Info 2 Each area of the building must support Fast Ethernet connections to the backbone Gathered from Management 14Jan01 Network TBD TBD Database, Visualization, Manufacturing, and Payroll applications are considered missioncritical for this company.