The subject of boundary value problems (BVPs) has a long and enriched history ranging from its theoretical (existence and uniqueness of solutions) development to the methods and techniques of finding or approximating their solutions. Boundary value problems arise naturally in a variety of applied fields and can be categorized as well-posed and ill-posed: local and nonlocal: linear and nonlinear: singular and nonsingular: free and fixed problems. Ordinary, partial, functional, fractional, and integrodifferential equations together with the boundary data varying from two-point and periodic to multipoint and nonlocal boundary conditions constitute interesting and important classes of boundary value problems. We invite investigators to contribute to the continuing efforts for exploring new aspects of boundary value problems by submitting review and original research articles to this special issue. Potential topics include, but are not limited to:

• Existence and uniqueness of solutions
• Analytical methods
• Iterative methods
• Perturbation techniques
• Numerical techniques
• Applications in physical sciences
• Applications in engineering, biology, and medicine
• Applications in economics and social sciences

Before submission authors should carefully read over the journal's Author Guidelines, which are located at http://www.hindawi.com/journals/aaa/guidelines/. Prospective authors should submit an electronic copy of their complete manuscript through the journal Manuscript Tracking System at http://mts.hindawi.com/submit/journals/aaa/rtbvp/ according to the following timetable: