| Criteria \ Cooperation models | Fixed price | Time and materials | Dedicated developer / team |
|---|---|---|---|
| Detailed specification | Required | Not required | Not required |
| Plan of work | Strict | Flexible | Flexible |
| Changes | Allowed at extra charge | Allowed | Allowed |
| Dedicated human resources | No | No | Yes |
| Work schedule | Part-time | Upon agreement | Full-time (on average 168 hours per month) |
| Developer’s availability | Not disclosed | Upon agreement | Permanent during working day |
| Hourly rate | High | Moderate | Low |
| Idle time | N/A | N/A | Paid by customer |
| Ukrainian Bank Holidays | N/A | N/A | Paid by customer |
| Annual 4 weeks vacation (as per Ukrainian law) | N/A | N/A | Paid by customer |
| Days-off | N/A | N/A | To be worked out by developer or deducted from monthly fee |
| Overtimes | N/A | N/A | Paid by customer |
| Tariff | Fixed amount | Rate per hour | Monthly rate |
| Payment scheme | 50% – Upfront payment 50% – Once approved |
Monthly | Monthly |
| Upfront payment | 50% | 50% | Equivalent to 1 team-month |
| Client’s involvement | Low | High | Adjustable |
| Project duration | Up to 2 months | Up to 6 months | More than 6 months |
| Average time to start | 1 week | 2-4 weeks | 1-2 months |
| Support and bugs fixing | 1 month subscription | N/A | N/A |
| Retention of knowledge | Low | Low | High |
| Retention of developers | Low | Low | High |
| Training Programs | Absent | Absent | According to the customer’s specific requests |
| Dedicated hardware and software infrastructure | No | No | Yes |
| Intellectual property | Belongs to customer | Belongs to customer | Belongs to customer |