The Educational Amendments Act of 1974 added an evaluation requirement to Title I legislation. Models of evaluation were required to specify techniques and criteria which facilitate comparisons of programs on a statewide or nationwide basis. The School District of Philadelphia conducted simulated studies of three evaluation models to determine implementation problems and barriers regarding Title I evaluation and considered how these experiences should guide Federal policy and legislation in other programs. Four categories of barriers to smooth implementation were identified: (1) validity of evaluative measurement devices; (2) accuracy of systems for sampling, testing, and evaluation; (3) aggregation issues regarding levels at which results can or should be used; and (4) issues of interpretation and application of data. It was concluded that Title I evaluation models may be theoretically sound; however, application may lead to inconsistencies. (Author/MK)