Dr. Andy Seddon Staffordshire UNIVERSITY School of Computing SSADM S tructured S ystems A nalysis and D esign M ethod

Dr. Andy Seddon Staffordshire UNIVERSITY School of Computing History of SSADM l Original version developed from LSDM l Selected by the former Central Computer and Telecommunications Agency (CCTA) – now part of the Office of Government Commerce (OGC) l Supported by the National Computing Centre (NCC) and other organisations l Title is Crown Copyright but anyone is entitled to use methodology free of charge l Now in Version 4+

Dr. Andy Seddon Staffordshire UNIVERSITY School of Computing Purpose of SSADM l improved project planning and control l more effective use of experienced and inexperienced staff l better quality systems l resilience to loss of key staff l supportable by computer based tools l good communication between developers and end users

Dr. Andy Seddon Staffordshire UNIVERSITY School of Computing Main Features of SSADM l A government standard l Data driven l Logical and physical views of the system l Utilises differing views of the system l Requires user involvement l Top-down and bottom-up techniques l Diagrammatic and non-diagrammatic techniques l Links to quality assurance, project management, risk assessment and other project procedures

Dr. Andy Seddon Staffordshire UNIVERSITY School of Computing Modules and Stages of SSADM Stage 0 Feasibility Feasibility Study Module Stage 1 Investigate current environment Stage 2 Business system options Requirements Analysis Module Stage 3 Definition of requirements Requirements Specification Module Stage 4 Technical system options Stage 5 Logical design Logical System Specification Module Stage 6 Physical design Physical Design Module

Dr. Andy Seddon Staffordshire UNIVERSITY School of Computing Diagrammatic Techniques l Logical data modelling l Data flow modelling l Entity/event modelling (Entity life history and Effect correspondence diagramming) l Enquiry access paths l I/O structuring l Dialogue design l Logical database process design

Dr. Andy Seddon Staffordshire UNIVERSITY School of Computing Non-diagrammatic Techniques l Relational data analysis l Requirements definition l Function definition l Formulation of options l Specification prototyping