Validity
A test is said to be valid if it measures accurately what it is supposed to be measure (fluency, pronunciation, grammar, etc.) including a coherent way to score the responses.
Reliability
Because human being do not behave the same way on every occasion; a test is said to be reliable when a students gets approximately the same score in the same type of texts in different occasions.
Practicality
A text must be simple, economical and easy, but keeping certain degree of quality; this means, that the text must be useful and competent to complete with the task of evaluate students.
Backwash effects
Testing should be shown as another tool for learning, the term “backwash effect” refers to the notion that students have about tests (could be positive or negative), because they may feel pressure at the time of doing the test or they may just see it as another way to corroborate their knowledge.
Jesus Aldair Garcia Rubio.
Validity: it has 3 categorizes that are content, construct and criterion-related evidence. This is the item that we use to measure what we want to measure (can be reading, grammar, spelling etc.).
Reliability: this is obtained if we apply a test to different students in the same level with the same of language and if they get similar scores. This also works if we apply the same test twice in a student and he got pretty similar scores.
Practicality: we should made easy exams but without losing the purposes or making them way to easier for the students. The must always be a balance between the useful and the easy of the test.
Backwash effects: these effects can be positive or negative depending of the impact of the test in either teacher or student. We can avoid negative effects if we tell the students that a test it is nothing more than a teacher tool just between many others.
Levid Miranda.