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What qualifies as a system? By Eugene le Roux, FSAIRAC, and Eamonn Ryan
A practical perspective for engineers and managers.
The word‘ system’ is used so often in engineering, management and everyday conversation that its meaning can become blurred. Yet, understanding what truly qualifies as a system is more than a semantic exercise – it directly influences how we analyse, design and manage complex situations, particularly in technical fields like HVAC & R and project management.
At its core, a system can be understood as a collection of interconnected components that work together to achieve a common purpose. These components interact in structured ways, often with inputs, processes and outputs. However, the boundaries of what we define as a system – and how we interpret its purpose – can vary significantly depending on perspective. Consider a few examples. A skeleton, such as that of a cat or dog, may not immediately be seen as a system in isolation. Yet, it can be viewed as a structural system: a framework of bones connected by joints, supporting movement and protecting vital organs. When considered together with muscles, tendons and nerves, it becomes part of a broader musculoskeletal system. The key lies in whether we are examining it as a standalone structure or as part of a larger, integrated whole.
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The physiology of a person, such as the digestive system, is more obviously a system. It has clearly defined inputs( food), processes( digestion and absorption) and outputs( waste and nutrients). Its purpose is explicit, and its components are interdependent. This type of system is often used as a model in engineering because of its clarity and functional organisation.
Social structures further expand the concept. A family, for instance, can certainly be seen as a system: individuals interacting within defined roles, influenced by shared history, communication patterns and external pressures. Extending the boundary to include uncles, aunts and grandparents introduces additional complexity, but the principle remains the same. The system simply becomes larger and more interconnected. In the engineering realm, systems are more easily recognised. An internal combustion engine, an electric motor or an air-conditioning installation for a large building are classic examples. Each consists of multiple components working together to perform a specific function. These systems are typically designed with clear objectives, measurable performance criteria and defined interfaces.
Yet even here, perspective matters. An air-conditioning system, for example, can be viewed narrowly as a collection of
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mechanical components: or more broadly as part of a building-wide environmental control system, interacting with occupancy patterns, energy management strategies and even weather conditions.
Organisational structures – such as company management or military command – also qualify as systems. They consist of hierarchies, communication channels, decision-making processes and feedback mechanisms. Like mechanical systems, they require co-ordination and alignment to function effectively. However, they are influenced heavily by human factors, making them less predictable and more dynamic.
So, does the way we define a system influence how we manage it? Absolutely.
In project management, the boundaries we set around a system determine what we consider relevant. A narrow view may simplify analysis but risk overlooking critical interactions. A broader view may provide deeper insight but introduce complexity that is difficult to manage. Striking the right balance is essential.
For instance, treating an HVAC installation purely as a technical system may lead to efficient equipment selection but overlook user behaviour or maintenance practices. Conversely, viewing it as part of a larger building ecosystem may lead to more sustainable and resilient solutions.
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Eugene le Roux.
The same applies to people. Viewing psychology as a system encourages structured thinking about motivation, communication and performance. It allows managers to identify patterns, anticipate responses and design interventions more effectively.
Ultimately, a system is not just defined by its components, but by the relationships between them and the purpose they serve. Recognising this enables more holistic thinking – an essential skill in today’ s increasingly complex world. CLA
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© Cold Link Africa |
The tools of the trade: Using simple finance systems to stay in control
By Rob Burger, small business finance and strategy consultant, 2XR Business Solutions Most HVAC & R contractors don’ t lose money because they’ re bad at their craft. They lose money because they don’ t track it properly.
You can be flat-out busy, working long hours, with jobs booked weeks ahead, and still run into cash flow problems. The difference between a contracting business that survives and one that struggles usually comes down to one thing: simple financial systems.
You don’ t need fancy accounting software. You don’ t need to be a finance expert. You just need a few practical tools and the discipline to use them. All you need is a basic computer with a spreadsheet. If you don’ t have a computer, an A4 notebook will also work.
START WITH A SIMPLE JOB TRACKING SPREADSHEET
A basic spreadsheet is still one of the best tools available. It gives you control and visibility without complexity.
Create a table and track each job with the following columns:
• Customer name
• Job description
• Quoted amount
• Labour cost( your time or staff time)
• Materials cost
• Total cost
• Profit
• Invoice number
• Paid( Yes / No)
• Payment date
This immediately shows you which jobs are making money and which ones aren’ t. Many contractors and / or tradespeople only look at money in the bank. That’ s dangerous.
A spreadsheet tells you whether you are actually profitable.
It also helps with pricing. After a few months, patterns emerge. You start seeing which types of jobs are worth chasing and which ones to avoid. Invoicing is important. Handwritten invoices and WhatsApp payment requests create confusion. They also delay payment. Use a simple invoicing tool. It can be:
• Excel invoice template
• PDF invoice from Word
• Basic invoicing app
• Accounting software
The important thing is consistency. Every invoice should include:
• Your business name and contact details
• Customer name
• Job description
• Amount
• Payment terms( for example: Due on receipt)
• Bank details
• Invoice number
Numbered invoices matter more than people think. They help you track missing payments and avoid disputes. Send invoices immediately after completing the job. Not later that evening. Not the next day. Immediately. The faster the invoice goes out, the faster you get paid.
TRACK PAYMENTS PROPERLY
This is where many small businesses fall down. They send invoices but don’ t track whether they’ ve been paid. Create a simple‘ Debtors List’ with:
• Invoice number
• Customer name
• Invoice amount
• Date issued
• Due date
• Paid( Yes / No)
• Days outstanding
Review this list once a week. It takes five minutes and keeps your cash flow under control. If an invoice is overdue:
• 7 days: friendly reminder
• 14 days: follow-up call
• 30 days: stop new work until paid
This isn’ t being difficult. It’ s running a business.
Another practical step is to sign up for a mobile card payment solution where you use your cell phone as a credit card machine, or a small card machine. These systems allow you to take card payments on the spot. When the job is finished, ask the customer to pay immediately. No invoicing delays, no chasing payments, and no awkward follow-ups. The money is in your account within a day or two, and your cash flow improves instantly. Many small business owners who switch to on-site card payments find that late payments almost disappear.
One of the simplest but most powerful tools is a separate business bank account. All customer payments go into this account. All expenses come out of this account. This makes it easy to see what you earned, what you spent and what is left. Pay yourself a
set amount weekly or monthly. This builds discipline and stops you from dipping into business cash.
KEEP IT SIMPLE AND CONSISTENT
You don’ t need complex systems. You need consistent ones: A spreadsheet to track jobs, a simple invoice template, mobile credit card machine, a payment tracking list, a separate bank account. That’ s it.
These tools won’ t take more than 30 minutes a week to maintain. But they will change how you see your business. You’ ll know where you’ re making money, who pays late and whether your pricing works.
Good contractors focus on the job. Successful contractors also track the numbers. CLA
About the author: Rob Burger CA( SA) is a finance and strategy consultant who helps small businesses, contractors and professionals simplify their finances and grow sustainably. He has 30 years of experience in business and now focuses on helping SMEs build stronger, more profitable enterprises.
June 2026 www. coldlinkafrica. co. za COLD LINK AFRICA
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Supplied by Rob Burger