List of Articles Directional distance function Open Access Article Abstract Page Full-Text 1 - Assessment of two-stage processes cross-efficiency in the presence of undesirable factors Alireza Amirteimoori Maryam Nematizadeh Maryeh Nematizadeh 10.30495/ijdea.2022.69944.1187 Open Access Article Abstract Page Full-Text 2 - Profit efficiency in non competitive market Ghasem Tohidi Simin Tohidnia Open Access Article Abstract Page Full-Text 3 - A Modified Directional Distance Formulation of DEA with Malmquist Index to Assess Bankruptcy E. Mirzaie N. Malekmohammadi Open Access Article Abstract Page Full-Text 4 - Using Directional Distance Functions to Determine Ranking Ranges in Cross-efficiency Evaluations Elmira Molahezekara Najmeh Malekmohammadi Open Access Article Abstract Page Full-Text 5 - Interval Malmquist Productivity Index in DEA N. Aghayi B.H. Maleki Open Access Article Abstract Page Full-Text 6 - An inverse DEA approach in the presence of undesirable outputs based on the directional distance function Javad Gerami