Modified form mixed methods. When the budget and/or timeline prohibit the use of pure form, the modified form of mixed methods is a viable alternative. In the modified form, evaluators alter the structure and procedures of the qualitative and/or quantitative methods or use less expensive or less rigorous applications to save money or meet restrictive timelines. Using the complementarity strategy as an example, the modification could be with respect to the qualitative methods, the quantitative methods, or both. For example, on the qualitative methods side, the application of a case study might be carried out as a site visit for a few weeks rather than a rigorous field study lasting several months or years. On the quantitative side, a survey instrument might be used with a hundred clients rather than a thousand, which might have been needed to obtain a large representative sample. In this situation, the modified forms of qualitative or quantitative methods used in the complementarity strategy are weak if they are judged individually from the perspective of a mono-qualitative or a mono-quantitative methodology. The merits of the modified form mixed methods in the complementarity strategy emerge in their totality. In other words, a new set of criteria needs to established for judging the quality of the modified from of mixed methods evaluation and research. This new set of criteria has not been systematically discussed or developed yet in the literature. Future studies in this area are greatly needed.