you can also modify the scale items to measure Self-Efficacy in a specific social or personal domains (e.g: I can always manage to solve difficult problems if I try hard enough = I can always manage to solve difficult problems (in school/with other teachers/in my family) if I try hard enough.
Administration: The GSE is a 10-item scale with a score for each question ranging from 1 to 4. Higher scores indicate stronger patient’s belief in self-efficacy.
Constructs Measured: The GSE is designed to assess optimistic self-beliefs used to cope with a variety of demands in life. The scale was designed to assess self efficacy, i.e., the belief that one’s actions are responsible for successful outcomes.
Reliability and Validity: Several studies have shown that the GSE has high reliability, stability, and construct validity. The scale was found to be configurally equivalent across 28 nations, and it forms only one global dimension.
Assessment in Minorities and Elderly: The GSE has been translated into over 28 languages. Subjects have ranged in age from 16 to 86.
I have also used the Taylor and Todd (1995) self-efficacy scale that Adil mentioned. It works well for technological contexts, which is what it was used for in the original study.
There is no one measure of self efficacy as I have said before--it has to be tailor made to the task or domain in question-there are trait scales (general SE) but Bandura's disapproves of these-