As Computing Mark Scheme

Degree Mark Scheme for the Might/June 2009 query paper for the steerage of lecturers , most uncooked mark. This mark scheme is revealed as an support to lecturers and candidates, to point the necessities of the examination. It exhibits the idea on which Examiners have been instructed to award marks. It doesn't point out the main points of the discussions that passed off at an Examiners’ assembly earlier than marking started, which might have thought of the acceptability of different solutions. Mark schemes have to be learn along side the query papers and the report on the examination. CIE won't enter into discussions or correspondence in reference to these mark schemes. CIE is publishing the mark schemes for the Might/June 2009 query papers for many IGCSE, GCE Superior Degree and Superior Subsidiary Degree syllabuses and a few Atypical Degree syllabuses.  Mark Scheme Academics’ model GCE A/AS LEVEL – Might/June 2009 Syllabus To permit the consumer to offer the pc information/change information into laptop comprehensible type To permit the pc to offer data/talk with the pc/to vary data from laptop into human comprehensible type To maintain information whereas the pc is just not utilizing it (1 per dotty) [3] (b) Black and white laser -e. g. Use in workplace to provide letters Produces top quality/speedy so doesn't develop giant queue on a LAN Color laser -e. g. To provide stories for a gathering Prime quality outputs/can produce giant amount rapidly Dot Matrix - e. g. Print receipts at checkout/tickets on railway Produces a couple of copy at a time, one for buyer + one for store Inkjet -e. g. Doing homework at dwelling Comparatively low cost and slowness doesn't matter Plotter -e. g. Produce architect’s plans Precision drawing software Braille printer Producing paperwork/books for blind individuals Outputs bodily/3D type of information (three per sort, max three sorts, max 9) Benefit Processed/Searched extra simply/rapidly/Estimate of file dimension is less complicated -e. g. When a buyer needs to know the supply of an merchandise the file might be discovered rapidly/makes number of storage simpler Drawback The dimensions of fields have to be decided earlier than use so house is usually wasted/not ample -e. g. The “description” discipline might not be giant sufficient for a selected merchandise. 1 per -, max four) [4] three Working from dwelling Fewer journeys/extra free time/much less supervision… Several types of jobs/jobs misplaced/job alternatives arising Manufacturing line/handbook jobs being misplaced/changed by extra technical jobs Work performed might be extra seen to managers All work/instances working might be seen/resulting in rewards the place applicable/sanctions when poor effort Security of staff is improved Computer systems/robots do harmful duties/can be utilized to precisely monitor harmful processes Work time might be much less inflexible Work might be fitted in spherical different commitments/results in easier methods of job sharing The 24 hour job/workplace/dedication/world workforce Staff might all the time be contactable/all through the world/communications.  Mark factors Begins with 5 (as first output) Loop with working situation Counter appropriately incremented 5 Choices seem on display screen from which to pick out Choice might result in submenus Menus organized in a tree construction (from single root to many branches) Use: In a passive data system e. g. Vacationer information at a prepare station. (1 to be used, + 2 different -, max three) Follows a spoken language permitting consumer to enter queries in regular vocabulary/syntax Laptop understands key phrases/positions in sentence to get concept of syntax Will then search database for key phrase to offer output or responses. Use: e. g. On an skilled system or search engine. 1 to be used, + 2 different -, max three) Offers utility packages to permit consumer to hold out upkeep duties (any three) Offers safety measures like passwords and identifications. Controls the hardware and the operations they permit. Offers translators to transform software program right into a type useable by the pc. Manages interrupts. To supply a platform for the execution of software program (1 per -, max three) Information is transmitted alongside a single wire/one bit at a time. Information is transmitted alongside quite a lot of wires/one byte (or extra) at a time. Information can solely be transmitted in a single course. Information might be transmitted in each instructions however solely one after the other. Every byte incorporates an excellent variety of 1’s A particular bit is ready to zero or 1 to make sure that complete is even. Byte is checked for even variety of 1’s after transmission. (1 per -, max 2) When two bits are in error the errors cancel one another out/10101001. Collected information enter to system by way of HCI/robotically Information enter is in comparison with library of knowledge to search out matches… by inference engine… Utilizing guidelines present in rule base Selections made about geologic construction reported by means of HCI. (1 per -, max four) [4] Web site map a diagram displaying the way in which the totally different screens match collectively exhibits the hyperlinks between screens, Gantt chart/progress chart exhibits the totally different components that should be developed exhibits which components of the event are unbiased and that are reliant on one another. Spider diagram to indicate interplay between the totally different components of the answer and people components that are unbiased of one another. Circulate diagram to indicate the order of manufacturing the components of the answer or to indicate the stream by means of the proposed web site. (As much as 2 teams, as much as 2 per group, max four) Documentation for proprietor of web site might be paper primarily based will comprise directions for altering/sustaining web site Documentation for viewer/customer to web site might be on-screen giving detailed assistance on searches/use of amenities/communication with web site proprietor… Sound Music to accompany the images/speech to elucidate the images…. Video/animation Transferring footage to higher describe the item on the positioning Computerized exhausting copy/saving Computerized downloading of knowledge to printer/exhausting drive for future reference. Hyperlinks Permitting entry to totally different websites/components of web site (As much as 2 teams, as much as 2 per group, max four) Color: Distinction Company schemes Aggressive/passive/soothing color schemes Consistency over web site to make web site look cohesive Use color to offer emphasis Accessability points e. g. color blindness Format Constant format so consumer will get used to ‘what's the place’. Vital issues to prime and left Information unfold out throughout complete display screen Tab order Group related information collectively Content material: Restrict to quantity of content material on a web page Content material on a web page is cohesive Content material matches the revealed intentions of the positioning Content material is of smart sort and studying age for viewers. (1 per -, max 2 per group, max 6) The bit price is a measure of the speed that information might be despatched throughout the communication medium Completely different communication media have totally different bit charges For easy textual content/nonetheless footage…a low bit price connection is ample as a result of quantity of knowledge per web page is low and stuck For (stay) video/sound…bit price must be excessive -because giant quantity of knowledge which have to be downloaded in actual time as a result of… data is time delicate. Customized written software program is particularly written/in response to the necessities of the shopper Off the shelf is available/wants tailoring to the wants of the shopper no delay as it's prepared instantly No scarcity of skilled customers/prepared educated/No studying curve Software program ought to be error free Assist obtainable by means of Web/colleagues/programs Appropriate with different customers/software program (1 per -, max 2) Examine information enter to make sure it matches supply information Typed in twice… by totally different individuals/at totally different instances inputs checked in opposition to one another for errors handbook examine by evaluating… display screen output of enter with unique doc. (1 for first -, + any 2 different -, max three) Examine information enter is wise/follows set guidelines/are affordable Information sort/ought to be numeric Information format/ought to be in forex type/xxx. xx Size examine/enter ought to be < x characters Presence examine/one thing has been enter. Vary examine/worth between zero and a few higher restrict (1 for first -, + any 2 different -, max three)
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