the accessible population might be homeless males between the ages of 30 and 50 in six selected urban areas across the KenyaSAMPLING FRAME: is the list of all the members of the population under investigation. The researcher can obtain one from the relevant bodies or develop one in case where such a list does not exist.Once you've identified the theoretical and accessible populations, you have to do one more thing before you can actually draw a sample -- you have to get a list of the members of the accessible population. (Or, you have to spell out in detail how you will contact them to assure representativeness). The listing of the accessible population from which you'll draw your sample is called the sampling frame. 3.4 SAMPLE POPULATIONSample population: is a sub-set of population or a small part of the target population which is thought to be a true representative of the whole population. It comprises of all the members selected from the population from which data will be collected and then generalized to the whole population.You actually draw your sample (using one of the many sampling procedures). The sampleis the group of people who you select to be in your study. Notice that I didn't say that the sample was the group of people who are actually inyour study. You may not be able to contact or recruit all of the people you actually sample, or some could drop out over the course of the study. The group that actually completes your study is a subsample of the sample -- it doesn't include non-respondents or dropouts. The problem of nonresponse and its effects on a study will be addressed when discussing "mortality" threats to internal validity.People often confuse what is meant by random selection with the idea of random assignment. You should make sure that you understand the distinction between random selection and random assignment.At this point, you should appreciate that sampling is a difficult multi-step process and that there are lots of places you can go wrong. In fact, as we move from each step to the next in identifying a sample, there is the possibility of introducing systematic error or bias. For instance, even if you are able to identify perfectly thepopulation of interest, you may not have access to all of them. And even if you do, you may not have a complete and accurate enumeration or sampling frame from which to select. And, even if you do, you may not draw the sample correctly or accurately. And, even if you do, they may not all come and they may not all stay. 3.5 SAMPLING/ SAMPLING TECHNIQUES/PROCEDURES /METHODSSampling refers to the process of selecting the individuals or objects from which to gather the information from the population. It is the process of selecting units (e.g., people, organizations) from a population of interest so that by studying the sample we may fairly generalize our results back to the population from which they were chosen.