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III) Limits of the scope of the solution
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Although the new system might solve many problems in the original one, there are still some limits and disadvantages of using the new system. First of all, the new system has higher costs than the old one. The original method of managing records was based on papers, but the new system must run in a computer. Therefore, the agency needs to spend lots of money on creating an environment for the new system. Secondly, although the new system is user-friendly and easy to use, the user still needs some basic computer skill, for example, installing and running the new system. Also, the user may not be very used to the change of the system, and this may reduce the efficiency of the new system. Thirdly, there are some limitations of a computerized system. For example, data can be lost due to an accident power-off, and attacks of the computer system can reduce the security of the data. Therefore, the user has to make regular back-ups of data.
| Table | Fields | Example | Maximum Size (in Bytes) | Size of table (in Bytes) * estimated number of records in a year |
| Flat Info | Flat ID | SNO2998764 | 142*20028400 | |
| Supplier ID | ||||
| Buyer ID | ||||
| RoomNo | A1603C | |||
| BuildingName_No | J111 Mao Building | |||
| StreetNarne | South R.. M.. Rd. | |||
| Area | ||||
| UnitPrice | ||||
| TotaiPrice | ||||
| Availability | Available | |||
| SupplieriD | ||||
| Supplier Info | CompanyName | S.. M.. Real Estate Inc. | 60*20=1200 | |
| BuyerlD | ||||
| Buyer Info | BuyerName | P.. P… | 253*150=37950 | |
| PhoneNumber | ||||
| PreviousAddress | Room352, No. 425 Lai 200. M.. Rd., P..District, Shanghai, China | |||
| Size of record in one year | ||||
| Add (+) overheads (10%) | ||||
| Size of Database (in KBs) | Approx. 73 |
6.4 Software development, programming, testing and installation
[Total 18 marks]
(i) Development [4 marks]
A technical description of how the solution relates to the design specification produced and agreed with the client should be included.
(ii) Programming [5 marks]
There should be clearly set out program listings that demonstrate the technical competence of the learner. Learners should make good use of the facilities of a procedural programming language as part of their solution, including (but not limited to) the use of object orientation, procedures, functions and modules.
Example 4a: pupil reporting system.
y of report
| (i) Development (4/4 marks) | Mark | Comments | |
| Program listings or evidence of tailoring of a software package is provided in the form of printouts. The developed solution does not fulfil the design specification. A teacher may award 1 mark if they have been shown the system working satisfactorily and there is no hard evidence in the project report. | Teacher’s comment – evidence of fully developed programmed solution, data structures including classes, database connection and I/O. Examiner’s comment – clear development that matches the design | ||
| 2-3 | Program listings or evidence of tailored software packages are provided in the form of printouts. Data structures are illustrated as part of the listings where appropriate, detailing their purpose. There is some annotation evident to illustrate how the package was tailored for a particular purpose or to indicate the purpose of sections of code in a program listing. The developed solution has logical flaws and does not fulfil the design specification. | ||
| Program listings or evidence of tailored software packages are provided in the form of printouts. Data structures are illustrated as part of the listings where appropriate, detailing their purpose. There is a full set of printouts showing input and output as well as data structures. The developed solution does fulfil the design specification. |
| (ii) Programming (5/5 marks) | Mark | Comments | |
| 1-2 | A program listing showing code written by the learner is included. | Teacher’s comment – excellent technical competence, Classes and sub routines help for code readability, meaningful variable names and well annotated. Examiner’s comment – agreed | |
| 3-4 | Some technical competence in programming shown by a program listing that makes use of meaningful identifier names, indentation and formatting to show the control structures used. The code should be annotated with some comments so that the logic of the solution can be followed. | ||
| Good technical competence in programming shown by a self-documented program listing that makes good use of meaningful identifier names, indentation and formatting to show the control structures used. The code should be annotated with comments so that the logic of the solution can be easily followed. |
Examiner Comment: samples of the type of material that the learner included for the development and programming sub-sections are included below:
· Data structures shown by table descriptions and relationships
· Input and output shown by forms and reports
· Processing shown by queries and programming code