Grade 11 Information Technology Study Guide

When a learner at a school in Polokwane uses a R6 000 laptop to type an assignment, look up CAPS notes online, and then writes a small Delphi program for a Grade 11 IT task, three different parts of the same subject are working together. Information Technology (IT) is the South African school subject that studies how computer hardware, software, networks and self-written programs combine to turn raw data into useful information. This first chapter does not teach you a new piece of hardware or a new line of code. Instead it shows you the shape of the whole Grade 11 year, reminds you of the Grade 10 foundation you are standing on, and gives you the working vocabulary you will need in every chapter that follows.

1.1 What Information Technology actually is

IT is built around the information-processing cycle: a computer accepts input, performs processing, produces output, and keeps results in storage, all tied together by communication. Data are raw, unorganised facts, such as the number 87. Information is data that have been processed so that they have meaning, such as "87 percent for the June IT test". A clear way to remember the difference is that you cannot make a decision from data alone, but you can act on information.

It also helps to know how IT differs from its sister subject, Computer Applications Technology (CAT). CAT focuses mainly on using ready-made application packages such as word processors and spreadsheets. IT goes deeper: you learn how the machine works inside, how networks move data, how databases store data, and, most importantly, how to write your own programs to solve problems. Roughly half of the Grade 11 IT year is spent on solution development, which is programming.

1.2 The five CAPS content strands of Grade 11 IT

The whole year is organised into five linked areas. Knowing them now means every later chapter has a place to belong.

• Hardware and System Software — the physical machine and the operating system that manages it.
• Communication and Network Technologies — how computers connect and share data, including the internet.
• Data and Information Management — databases and the SQL language used to question them.
• Solution Development — programming, the largest part of the year, where you design and build working applications.
• Social Implications — the ethical, legal and environmental effects of computing, taught throughout the year rather than only at the end.

1.3 Building on your Grade 10 foundation

Grade 11 assumes you already met certain ideas in Grade 10. You should recall that all data inside a computer are stored as binary, using only 0 and 1, where each digit is a bit and eight bits make a byte. You should remember that storage is measured in powers of a thousand, so 1 kilobyte is about 1 000 bytes, 1 megabyte about a million, and 1 gigabyte about a billion. You should also be comfortable with the basic programming building blocks: variables, the data types integer, real, string and boolean, and the three control structures of sequence, selection (if statements) and iteration (loops). Grade 11 does not re-teach these from zero; it extends them, for example by moving from single variables to whole lists of values called arrays.

1.4 How Grade 11 IT is assessed

IT is assessed in two main ways across the year. Theory covers hardware, networks, databases and social implications, and is examined in written papers. Practical work covers programming and database querying, examined on a computer. A large practical project, the Practical Assessment Task (PAT), runs across several terms and asks you to plan, build and document a real software solution. Because the PAT is spread over time, falling behind early is costly, so good work habits matter from week one.

1.5 Study habits that work for IT

• Type and run every code example yourself; reading code is not the same as understanding it.
• When a program fails, read the error message carefully before changing anything, because most errors point to the exact line.
• Keep a personal glossary of terms such as bit, byte, query and array, since the same words return in every chapter.
• Test a solution with sensible values and with awkward values, such as zero or a very large number, to check it does not break.
• Save your work often and keep dated backups, because losing a half-finished PAT is a real and avoidable disaster.

Master this roadmap and the rest of the year becomes a series of connected ideas rather than a pile of unrelated topics. Every chapter that follows fits into one of the five strands, and every strand feeds the goal of the subject: turning data into information and building the tools that do it.