HNC Flow Chart 1 IT Systems Analysis and Design SSADM – Design

HNC Flow Chart 2 Aims Discuss input, output and process specifications Gain an insight into,pseudo code flowcharts and decision tables

HNC Flow Chart 3 Process Design Design – Process descriptors –Processes would have been identified in the investigation stage. –It is important to define each process clearly to ensure that there is no unnecessary code implemented and the process does what was required.

HNC Flow Chart 4 Process Design Design – Process descriptors –The following methods are used to create process specification: Pseudo code Flow charts Decision tables

HNC Flow Chart 5 Process Design Design - Pseudo code –Structured English - describes the process in English (as appose to programming code). –Example “Add a product to a database” Open product database Check if product already exists, if it doesn’t Create new product record Assign product with unique product number Request the user to input product details Store product details if product already exists Display message to let the user know that the product has been added Close product database –You try and write some pseudo code to add a customer record to a database

HNC Flow Chart 6 Process Design Design – Flow charts –These are diagrams used to show how processes link in a systematic (logical) way. –It graphically represents decisions, processes and where the overall processes starts and ends.

HNC Flow Chart 7 Process Design Design – Flow charts Ovals or circles are used to represent where the main process starts and ends Decisions are represented as a diamond Rectangles are for processes (Active verbs i.e. send, calculate) (Active verbs i.e. send, calculate) This represents an input or output INPUT/ OUTPUT

HNC Flow Chart 8 Flowchart example We will attempt to model the flow chart outlined in task one Once you have helped your tutor complete the earlier example you need to attempt and create one yourself (task 2 and 3)

HNC Flow Chart 9 SSADM Decisions tables –Useful when there are a lot of different options to choose from and you want to identify what happens in each circumstance. –Used when a flow chart would be too complicated to draw.

HNC Flow Chart 10 Decisions tables Existing Customer YN Display Message X Add Customer to database X

HNC Flow Chart 11 Conclusion Discussed input, output and process specifications Gained an insight into,pseudo code flowcharts and decision tables