What is the difference between validation and verification in ict

Printed reports have to be designed to make sure that they are neat and tidy and easy to read. It doesn't matter what type of system is being created Web site, database, payroll etc , it is very important that clear designs are produced. If the system is built without proper planning , there is a good chance that faults will appear after system is created.

This would mean that the system would have to be changed in order to correct the faults. This would be very expensive and time consuming! Every part of the system is carefully designed and tasks include:. Designing data entry screens how will data be entered into system Designing user-interface layouts what will the system's menus, search facilities etc look like?

Designing printed outputs reports etc what will printed outputs look like Designing screen-based outputs what will outputs that are displayed on the screen look like? Designing structures to store data e.

Designing data verification methods - See below how will the system check that entered data is correct? We will now take a closer look at the last two items in the list above Validation is where a computer system checks that data entered by the user is sensible and usable. A validation check has shown that a student is too young to book a driving lesson. The system flags up the error.

Another validation check has picked up an error with a gender field probably a typing error. The system is instructing the user that they must enter male or female. The computer system will be programmed with a list of these checks that it can use to compare to the data that a user is entering. If the user try's to enter something that does not match up with items on the validation check list, the system will not accept the data.

These checks are often called 'Validation Rules'. An example of a validation rule - driving school booking system. Validation Check. Presence check. Checks that data has been entered and not missed out. If a user misses out required data such as a postcode , the system not allow them to progress. Checks that the correct number of characters has been entered. Performed on numbers to check they are within certain ranges. Performed on numbers to make sure that data is not above or below a specified limit.

Checks that entered data does not contain invalid characters. Pure number fields distance, temperature etc should not allow for text to be entered.

There are a number of validation types that can be used to check the data that is being entered. Validation curriculum-key-fact. Validation is an automatic computer check to ensure that the data entered is sensible and reasonable. It does not check the accuracy of data. Check digit. The last one or two digits in a code are used to check the other digits are correct. Bar code readers in supermarkets use check digits. Format check.

Checks the data is in the right format. Methods of Verification : Static Testing. Definition : The process of evaluating software during or at the end of the development process to determine whether it satisfies specified requirements. Validation is the process of evaluating the final product to check whether the software meets the customer expectations and requirements. It is a dynamic mechanism of validating and testing the actual product.

Methods of Validation : Dynamic Testing. Validation is the process of checking whether the specification captures the customer's needs. Verification is the process of checking that the software meets the specification. Table of Contents. Software Testing Tutorial. Next Lesson. Share this post:. Severity Vs Priority.