THE EUROPEAN REFERENCE FRAMEWORK FOR LANGUAGES (CEFR):
Can understand and use familiar, everyday expressions and very simple statements aimed at meeting concrete needs. Can introduce himself or herself or someone and ask someone questions about them - for example, where they live, relationships, what belongs to them, etc. - and can answer the same type of questions. Can communicate in a simple manner if the interlocutor speaks slowly and clearly and is cooperative.
Can understand isolated sentences and frequently used expressions related to immediate areas of priority (eg, simple personal and family information, shopping, immediate environment, work). Can communicate in simple, routine tasks requiring a simple and direct exchange of information on familiar and routine matters. Can describe their training and immediate environment using simple means and bring up subjects that correspond to immediate needs.
Can understand the essentials when plain, standard language is used and if these are familiar things at work, at school, at leisure, etc. Can cope with most situations encountered while traveling in an area where the target language is spoken. Can produce simple, coherent speech on familiar topics and in areas of interest. Can relate an event, experience or dream, describe a hope or goal, and briefly state reasons or explanations for a project or idea.
Can understand the essential content of concrete or abstract topics in a complex text, including technical discussion in their specialty. Can communicate with a degree of spontaneity and fluency such as conversation with a native speaker without stress on either side. Can express himself clearly and in detail on a wide range of subjects, give an opinion on a topical subject and explain the advantages and disadvantages of different possibilities.
Can understand a wide range of demanding, long texts and recognize implicit meanings. Can express himself spontaneously and fluently without apparently having to search for words. Can use the language efficiently and flexibly in social, professional or academic life. Can express himself on complex subjects in a clear and well-structured manner and demonstrate control of the tools of organization, articulation and cohesion of speech.
Can effortlessly understand virtually everything he / she reads or hears. Can reproduce facts and arguments from a variety of written and oral sources, summarizing them in a coherent fashion. Can express himself spontaneously, very fluently and precisely, and can distinguish fine nuances of meaning in connection with complex matters.