1.Start Up Page 2. Start Up Options

3. Options

4. Target Weight 5. Data Validation

6.MUAC 7. Oedema

8. Gender 9.Age

10. Length or Height 11. Length

12. Weight 13. Data Validation Summary

14. Summary 15. Help

USE CASES and UI:

Top goals of the app1) Output a precise Z score, not a range, and a malnutrition classification of the child2) Provide the user with the facility to calculate two other Z Scores – height for age

and weight for age – thereby enabling them to assess the child more holistically3) Add error checking and data validation mechanisms, which are not available in the

current paper version of the chart, to minimize errors in diagnosis.4) Allow and account for the different target weight used by different malnutrition

programs to assess children

With 7 options in just the advanced mode, there are a number of possible use cases. We choose to focus on the top 7 cases.

Considering the aims of the app, the use case priorities are:

Use Case 1- Standard

Standard mode is the highest priority use case, as per the client request. In this mode, the program calculates only the Weight for Height Z Score.

The ‘Standard’ button in the Star Up Options Page is larger than the ‘Advanced’ button (as seen in the UI below) so as to encourage the users to use the application in the Standard mode. In this mode, the summary page displays only the information relevant to the Standard mode. To make resizing easier, the summary page is designed to display information related to the standard mode first.

Use Case 2 -Advanced with all options

This is our second highest priority because with all the option selected, the app runs in the full-fledged mode accounting for errors, median and target weights and calculates 3 different Z scores. This gives a comprehensive diagnosis of the child.

Use Case 3 - Age, MUAC & Oedema, Data Validation and Double Data Entry

This is use case 3 because it implements both error checking and the 2 additional Z Score calculations. MUAC and Oedema impact malnutrition classification of the child.

With the data validation option on, the app asks the user if they want to re-enter values when the Z score calculated lies beyond the limits specified. To make the re-entry of values consistent with the original screen flow, we clubbed the screens related to the Z score calculations at the end. This way when the user wants to re-enter values he/she will be directed to a sub sect of the original screen flow and the screens will be displayed in the same consistent order as before.

Use Case 4 - Advanced with Age

This is use case 4 because with only the age setting on, the app can calculate HAZ and WAZ. The main feature of the app is Z score calculations and therefore, the ability to calculate these additional Z scores with age is a priority.

Use Case 5 -Target Weight

This use case gives the flexibility to change the target weight according to the specifications of different programs

Use Case 6 - Median Weight

The median weight does not feature into calculations but is displayed in the summary page if chosen.

Use Case 7 - Length or Height and Age

The app already accounts for the various length height discrepancies. For instance, if the value entered is <87cm, and Length or height is not specified, the app reads from the length charts. However, in addition to this, the app gives the user the option to explicitly specify whether the measurement entered is length or height.