Master Shingle Applicator™ (MSA) This educational program is for shingle installers and is based on the Shingle Applicator’s Manual, which contains approved procedures for proper shingle installation as well as commonly accepted trade practices. Only those contractors who have mastered every aspect of shingle installation earn the MSA credential. Quality Master™ Another educational program, based on the Shingle Technology Manual, provides contractors with comprehensive knowledge of asphalt shingles – how they’re made, and what to look for in a quality product. A contractor who holds this credential has taken the time to study the complexities of asphalt shingle technology so he can explain the performance differences to you.