The selection of a good crop variety is an important management decision producers make for their farm. It can often mean the difference between breaking even and making a profit. Agronomists often struggle with summarizing and accurately describing variety performance due to the large amount of data and the many methods for describing performance. The software program, SELECT! version 1.0, is a microcomputer based decision support system for selecting crop varieties. SELECT! links variety traits and trial characteristics with actual variety performance. Its objectives are to assist producers, county agents, and other crop consultants in evaluating crop variety adaptation and performance using data from evaluation trials conducted by the agricultural experiment station, and to provide producers with production information regarding crops and varieties. Varieties selected by producers should be planted and evaluated on a trial basis using their farm management practices. Research Question The selection of a good variety is one of the most important management decisions producers make for their farms. Selecting the correct crop variety can often mean the difference between breaking even and making a profit. Plant breeders test thousands of new experimental varieties for several years at many locations over a range of plant populations and other management practices. The results of variety evaluations are popular among producers. But, the amount of information available can be daunting to producers and make their variety selection decision difficult. The computer software program, SELECT!, is a decision support system for selecting crop varieties. SELECT! links variety traits and trial characteristics with variety performance tested in state agricultural experiment station trials. Its objectives are to assist producers, county agents, and other crop consultants in evaluating crop variety adaptation and performance using data from evaluation trials conducted by the agricultural experiment station, and to provide agricultural producers with production information regarding crops and varieties. Varieties selected by producers should be planted and evaluated on a trial basis using their farm management practices. Software Description SELECT! was written using Clipper and C programming languages. SELECT! requires an IBM PC, XT or AT, or a 100% IBM compatible computer. The computer must include the following features: (i) PC-DOS or MS-DOS Version 3.1 or greater for single-user applications or network applications, (ii) 384K, or more, of Random Access Memory (RAM), (iii) one diskette and one hard disk drive, (iv) ANSI terminal support, (v) a printer, and (vi) a math co-processor chip. In general, the faster the microprocessor of the computer, the better SELECT! will perform. SELECT! has virtual memory capabilities that will automatically use RAM, expanded memory, and, if necessary, hard disk space. The virtual memory manager provides up to 64 megabytes of accessible memory space, effectively removing any practical limitations on the memory requirements of SELECT! Applied Question Is the SELECT! program useful for selecting crop varieties? SELECT! is being used in the field by Wyoming county agents. Extension specialists tailor crop data bases for Wyoming. Early reviews of SELECT! beta test versions by county agents, crop consultants, and producers have been positive. Work continues on developing databases and tailoring crop production recommendations for Wyoming conditions.