8. Standard costs are used to establish a basis to assess the reasonableness of actual
costs. A comparison of standard costs to actual costs should help management
identify unexpected differences and then pursue explanations as to why actual costs
varied from the standard.
9. An overhead volume variance is the difference between (a) the amount of (fixed)
overhead that would have been budgeted at the actual operating level achieved
during the period (that is, budgeted fixed overhead) and (b) the standard amount of
(fixed) overhead applied to actual products produced during the period. A volume
variance occurs when the actual volume differs from the expected volume that is
used to establish the predetermined rate.
10. A predetermined standard overhead rate is a measure computed and used in a
standard cost system to assign overhead costs to products. Before the period
begins, budgeted total overhead costs (variable and fixed) at the expected volume
are divided by the expected amount of the allocation base (direct labor hours,
machine hours, or some other measure of activity). This yields the predetermined
standard overhead rate. Then as production activities occur, this predetermined
overhead rate is applied to the standard quantity of output produced to establish the
amount of overhead assigned to that output.
11. In general, variance analysis is said to provide information about price and quantity
variances.
12. A controllable variance is the difference between (a) the total overhead cost actually
incurred in the period and (b) the total overhead cost that would have been budgeted
at the actual operating level achieved. Specifically, the controllable variance is the
sum of the total variable overhead variances (both variable overhead spending and
efficiency variances) and the fixed overhead spending variance.