USPS Exam 421 Window Clerk Study Guide Solutions (2026/2027) |Verified

USPS Exam 421 Window Clerk Study Guide Solutions (2026/2027) |Verified

USPS Exam 421 Window Clerk Practice Exam

1.USPS Mission: Provide, trusted, affordable, universal

2.24-Hour Clock: Improve effectiveness through standardization &

innovation. End-to-end process to ensure mail is Collected, distributed,

and delivered. USPS runs on this.

3.Delivery Methods: Planes, trucks, cars, boats, bicycles, snow mobiles,

mules.

4.APC: Automated Postal Centers

5.Automated Postal Centers: Self-serve kiosks, commercial retail outlets,

banks, ATMs.

6.Mail Arrival Profile: Determines operational startup & staffing.

7.CET: Critical Entry Time

8.Clearance Time: Mail is cleared for dispatch.

9.18:00: Carriers in from street.

10.20:00: 80% of collection mail should be cancelled at the P&DC.

11.23:00: Out of primary processing.

12.24:00: Secondary Operations Complete

13.04:00-09:00: Distribute to DDC/DDU

14.07:00: 100% of DPS 2nd pass complete.

15.Core Responsibility: Security, Sanctity, Preserve, Protect - Instills

customer confidence, projects positive public image, maintains

competitive advantage, pro- tects privacy.

16.PolicyNet: Online resource to find handbooks, manuals, publications.17.Directives: Policies, Procedures, Regulations - Effects in four ways:

productiv- ity, revenue, legal liability, customer service.

18.DMM: Domestic Mail Manual

19.Domestic Mail Manual: DMM - Policies, procedures and regulatins for

domes- tic mail. Information on extra services, postage prices, mail

classes.

20.IMM: International Mail Manual

21.International Mail Manual: IMM - Mailing conditions for each

country, also includes a list of countries.

22.ASM: Adminstrative Support Manual

23.Administrative Support Manual: Policies, procedures for

adminstrative and support functions. Information covering audits,

investigations, communication, fa- cilities, equipment and privacy.

24.POM: Postal Operations Manual

25.Postal Operations Manual: Operations function of field

organizations. In- formation regarding retail, philatelic, collection,

mail processing, transportation, delivery, vehical operation.

26.ELM: Employee & Labor Relations Manual

27.Employee & Labor Relations Manual: Personnel policies and

regulations. Employee placement, pay, benefits, training, health and

environment, labor rela- tions.

28.F101: Field Accounting Procedures

29.AS or MS: Handbook ID for Administrative Support Manual (ASM)

30.DM: Handbook ID for Domestic Mail Manual (DMM)

31.EL or P: Handbook ID for Employee & Labor Relations Manual (ELM)

32.M: Handbook ID for Postal Operations Manual (POM) or

Administrative Sup- port Manual (ASM)