6.
111 Papers
Leslie C. Perelman 1 March 2006 Massachusetts Institute of Technology
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Introduction
Why documentation is important What is a document The elements of a 6.111 lab report How to write the report Focus on the Overview
Importance of Documentation
Clarifies and fixes ideas and procedures
For designers For others For further modifications and adaptations For troubleshooting For avoiding needless repetition of work
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Record of project
Importance of Precision
Sloppy facts and lack of precision can also destroy things Confusion over units of measure destroyed the Mars Lander
Engineers at NASA's Jet Propulsion Laboratory thought they were dealing in metric units -- or newtons per second -- when calculating spacecraft thrust, The Lockheed Martin Corp. team that built the system had programmed the measurements in English pounds per second.
The difference took the craft about 60 miles off course and into oblivion.
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What is a document?
Like your 6.111 Project, a document is an artifact that is designed and produced It is created
For specific purposes Title For specific audiences For specific uses TOC
Description
Abstract
It is modular
Tables & Figures Conclu -sion
Overview
Appendix
Elements of 6.111 Report
Title Informative Abstract Table of Contents List of Figures List of Tables Overview Description Conclusions Appendices
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How to Write the Report
Write it in stages
Overview Tables Figures Description Conclusion Appendices Lists of Tables & Figures Table of Contents Abstract Title
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Overview
Establishes the context and purpose of project Description of the whole before the parts Independent of abstract
Elements of the Overview
Background and context Statement of problem Description of devices purpose
What does it do? How does a user use it?
Description of devices uses
Brief description of subsystem organization Road map for reader
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Sample Overview IA
In any business or multi-user environment where phone service charges are made on a per call basis, it is desirable to keep a log of phone calls so individual calls may be charged to the actual callers. In addition, it is convenient to be able to dial frequently called numbers easily and to redial the last number that was dialed. The intent of this project is to demonstrate a system which performs these functions.
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Sample Overview IA
Context In any business or multi-user environment where phone service charges are made on a per call basis, Problem and Main Purpose it is desirable to keep a log of phone calls so individual calls may be charged to the actual callers. Additional Objectives In addition,
it is convenient to be able to dial frequently called numbers easily and to redial the last number that was dialed. The intent of this project is to demonstrate a system which performs these functions. 11
Summary Statement of Project
Sample Overview Perspective
IB
User
The user of this system sees an ordinary telephone with a few additional switches and indicator lights. The attached keypad produces the standard telephone tones. When the user picks up the receiver, she is prompted by a light to enter her two digit identification code to gain access to the phone system before being prompted to dial a phone number. The user may, if she wishes, turn on the set switch to set a short code. She is then prompted to enter a one digit short code. After entering this digit, the user enters a normal phone number. When she is done, she turns off the Set switch. The user may dial normally, automatically redial the last regularly dialed number by entering a *, or may use the autodial function by entering # followed by the short code digit. The user may hang up at any time. If the user wishes to place another call without reidentifying herself, she may press the pre-redial switch.
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Sample Overview IC Additional Functions
At any time when the phone is not in use, the phone call log may be produced. The Bill switch is depressed, causing a complete output of all previous calls. The record contains the users identification code, the date the call was made, and the actual number dialed. The day can be set to a number from 1 to 366, which specifies the day of the year. Two switches are available to change the date: one to simply increment the day by one, and the one which rapidly increments the counter while the switch is depressed.
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Sample Overview 1D Summary of Design
The project is divided into two main modules, called the master and the slave. The master monitors the actions of the slave and regulates the flow of information to and from the slave. The slave is responsible for all the interactions with the use, including auto-dial functions. A key element in the project is modularity. The master and the slave can be thought of as two semi-independent systems. For instance, the master has no way of knowing whether normal dialing or auto-dialing has produced a digit. A simple ready-acknowledge handshake is used to send digits to from the slave to the master. The two modules are in reality asynchronous, although for convenience they happen to run off the same clock. Because the two systems are modular and asynchronous, they can be tested independently.
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Sample Overview IE Advanced Organizer
This document describes the device's design and performance specifications followed by the testing and debugging procedure used in its development. Two minor technical problems are then noted and recommendations for further development are offered.
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