1st method: Once the three groups are organized into six groups which form pairs, it is then possible to proceed with the experiment. The first thing to do is to separate the women who smoke from the non-smokers. Once this is done, the following step is to give them a set of instructions. The instructions arrested the following: the group of non-smokers will have to continue their normal lives without smoking, whereas the smokers must proceed to smoke a minimum of six packs of cigarettes every two weeks and a maximum of fourteen, although the recommended amount is ten packs every two weeks. It is key to make sure these instructions are followed with mini-tests every cycle. This experiment is carried out during a space of two months. When this period of time finishes, the results showing levels of infertility in these women must be collected and examined.
2nd method: Once the three initial groups have been divided into six groups that form pair, the experiment can be carried out. The first thing to do is to give both groups a set of instructions. To the group of overweight women, the objective is for them to continue with their normal diet, without trying to lose weight. This instruction is the same for the other group of women, the non-overweight. However, the objective is for them to not gain weight. Then, for two months, every week it is fundamental to check and make sure the both sets of women are following the instructions so that it can be a fair experiment. Again, after the two months, the results must be collected and examined to determine the different levels of infertility when comparing a group of overweight women with a group of non-overweight women under the same circumstances.
3rd method: Once the three groups are divided into six groups which form pairs which are comparing each other, the experiment shall be carried out. In this occasion, the comparison is between a group of alcoholic women and a group of non-alcoholic women. Once the groups are sorted out, the next step is to give each group a set of instructions. For the group of non-alcoholics, the instructions are simple, they just have to continue without drinking during the two months that this experiment lasts. For the alcoholic women, the instructions are as follows: they will have to drink at least 250ml of alcohol every two weeks during the two-month period. After the two months, results which determine the level of infertility in women must be collected and examined.