This brief paper presents a sequential walk through a simple research setting--a two group experiment--to indicate common but avoidable design difficulties that may jeopardize the usefulness of the data obtained. The six flaws examined are the failure to select subjects from the population to which generalizations are to be made; failure to use randomization in assigning students to experimental and control groups; failure to use an adequate number of students; failure to maintain control over manipulation of the independent variable; failure to use reliable and/or valid measures of the dependent variable; and failure to use an appropriate statistical test. Several additional flaws that may creep into research studies are indicated in the closing comments, and three references are listed. (Author/RAO)