New Material

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Menger Sponge depth 5 photo by fdecomite on Flickr
Multi-stage sampling represents a more complicated form of cluster sampling in which larger clusters are further subdivided into smaller, more targeted groupings for the purposes of surveying. Despite its name, multi-stage sampling can in fact be easier to implement and can create a more representative sample of the population than a single sampling technique. Particularly in cases where a general sampling frame requires preliminary construction, multi-stage sampling can help reduce costs of large-scale survey research and limit the aspects of a population which needs to be included within the frame for sampling.
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Inside Purple Flower by Frank Starmer
Sequential sampling is a non-probabilistic sampling technique, initially developed as a tool for product quality control.  The sample size, n, is not fixed in advanced, nor is the timeframe of data collection.  The process begins, first, with the sampling of a single observation or a group of observations.  These are then tested to see whether or not the null hypothesis can be rejected.  If the null is not rejected, then another observation or group of observations is sampled and the test is run again.  In this way the test continues until the researcher is confident in his or her results.
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Bubblegum By Krystle Fleming
Stratified random sampling is a probabilistic sampling option. The first step in stratified random sampling is to split the population into strata, i.e. sections or segments. The strata are chosen to divide a population into important categories relevant to the research interest.
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Geneva Crowd photo by Andy Carvin
A simple random sample (SRS) is the most basic probabilistic option used for creating a sample from a population. Each SRS is made of individuals drawn from a larger population (represented by the variable N), completely at random. As a result, said individuals have an equal chance of being selected throughout the sampling process. The benefit of SRS is that as a result, the investigator is guaranteed to choose a sample which is representative of the population, which ensures statistically valid conclusions.
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People on village meeting by public domain images
Public consultations are usually conducted through public meetings to provide an opportunity for the community to raise issues of concern and respond to options.      
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Archery in Bhutan photo by brentolson on Flickr
Evaluations can use the program's stated objectives and goals to assess program success or failure. Program objectives and goals are generally determined at the beginning of the design process. Occassionally this has not been done, or the program goals have changed along the way. If this is the case, it can be useful to generate a project logic model - either collaboratively or through key inputs and then tested with team members.