Design stage

designing stage

Design stage is occur after the system has been analyzed so now its time to design the program carefully.

the programmer must have consideration while designing the program like:

1-the programmer must keep in mind that he add a guideline this is because new users may face some difficulties while using the program so guideline is a very important thing.   
2-the coloring must be properly so the user wont confused while using it or changing from slide to another
3-the programmer must add the validation rule so the chances of mistakes will be reduced much
4-the system must be easy to used as possible as can so the user can use the program without any confusion. 

as the picture shown the designing stage come directly after analyzing stage

program flow chart project

Documintation

Types of documentation

before implement the system a documentation should be provided to help user and programmer

Technical documentation:

this type of documentation is produced just for the programmer and the analyst and it help them if any error occur in the system ,and if they are planning to do any upgrading it will help them.

User documentation:

it help the user while he use the program and give tutorial on how use the program

the documentation help the user how to use the program and it include all the things that the user may face on it.

main types of of technical documentation:
1-system documentation
system documentation provide:
-test plans & test result so that the system  analyst can see the results,so if any error occur they can see the problem and remove the error by solving its problem
-what is expected of the data and show how the system must work so he can identify the errors
2-program documentation contain:
-the input and the output that has been used in the system
-the program flow chart that have been produced at the design stage
-the codes that has been used in the current program

the user documentation consist of :
-the purpose of this system
-the hardware & the software that is needed to run the system
-what the user shall do if an error has occurred

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how the analysis can collect the information

how the analysis can collect information

 Systems analysis is the study of sets of interacting entities, including computer systems analysis. This field is closely related to requirements analysis or operations research. It is also "an explicit formal inquiry carried out to help someone (referred to as the decision maker) identify a better course of action and make a better decision than he might otherwise have made.
its is the first stage on system analyzing where the analysis will analyse the existing system and see how the work get done and how the company make use of its programs and software   

 



development and testing (from the beginning till data types i explained)

Development and testing.pptx

Using spreadsheets(H.W)

Answers	Questions
Spreadsheet modeling is a computer program that allows you to create, edit and maintain full data in industries like financial services, customer services etc	What is spreadsheets modeling?
1-To create and design 2-Help you in a specific thing like calculations 3-To make the work more easy and interesting as well as attractive	List three uses of spreadsheets
CSV stand for : Comma separated values	What does csv file stand for

Calculating the ISBN number

((How to calculate ISBN))

hello guys

today am gonna be showing you how to calculate the isbn number(last digit)

Enjoy!!

ISBN numbers are created so that the first nine digits are information 
digits and the last digit, the one you want to calculate, is a check 
digit. This last number helps people notice and correct mistakes that 
might be made in recording the information digits.  

Here is an ISBN number: 0-205-12669-3. The digit 0 indicates the book 
is written for English-speaking people. The number 205 and the number 
12669 identify the publisher and the book published by that publisher.  

The last digit, the 3, was chosen in the following way. Each digit is 
given a weight by using the digits 1 to 10 and counting right to left. 
These weights are added. The sum is:

   0(10)+ 2(9)+ 0(8) + 5(7) + 1(6) + 2(5) + 6(4) + 6(3) + 9(2) + __(1)  

(The digits of the ISBN information numbers are listed in order left 
to right and weighted by counting down from 10 to 1.) The check digit 
is chosen to be a number from 0 to 10 so that this weighted sum is a
multiple of 11. That is, the sum must be divisible by 11. 

Let us see what sum we have so far with these particular nine 
information digits:

   0(10)+ 2(9)+ 0(8) + 5(7) + 1(6) + 2(5) + 6(4) + 6(3) + 9(2) 
     = 0 + 18 + 0 + 35 + 6 + 10 + 24 + 18 + 18 
     = 129

The check digit 3 was chosen because 129 + 3(1) = 132 and 132 is a 
multiple of 11. 129 is greater than 11(11) = 121 and 14 less than 
11(13) = 143. The only possible number from 0 to 10 to use as a check 
digit is 3.
  
Sometimes the only choice for a check number will be 10. Since this is 
a two digit number and cannot be used as such, the Roman numeral 10, 
the symbol X, is used.  

This system for assigning the last number of an ISBN number makes it 
possible to detect errors made by writing a single digit incorrectly 
or by writing a pair of digits in the wrong order.

Codes provide some interesting mathematics!LOL

you can also check this interesting site:

 http://www.hahnlibrary.net/libraries/isbncalc.html