While attempting the questions and specially for the machne readable sheets one must obtain the correct type of pencil and figure out how to correlate an answer sheet with a set of questions. Some investigators might provide you with the stationary but usually all these instructions are already given on admit card.

In such cases the only the keyed responses are taken into the acccount and therfore they must be carefully attempted.

The planned statistical analyses into consideration. Questions that should be resolved in the development phase include:

• What symbolic representation (in a computer readable data set) will the various response options have (e.g., numerals, letters, etc.)?
• How will nonresponse to an item be represented?
• How will unreadable responses (e.g., double marks) be represented?

Most readers are designed (or programmed) to recognize only a single response to each item. Therefore, it is necessary to modify items for which the instruction, "mark all that apply" would appear on a conventional questionnaire. You may use tabular representations and present your data.