Abnormal data - Data outside the limits of acceptability, or the wrong type of data, and should be rejected or cause an error message, Extreme data - Data at the limits of acceptability, Normal data - Data that is acceptable/reasonable and has an expected (known) outcome, Design stage - plan and develop the proposed system, System Analysis and Design - To look at an existing system and then designing a new system which can carry out same tasks better, Analysis Stage - Current system is looked in detail to find out what changes need to be made to make the new system better than old one, Length check - Checks that correct number of characters are entered, Verification - checking that the data entered is correct and matches the source of data,

IGCSE ICT Unit 7 Systems Life Cycle (Do Now)

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